- \n
- \u4e00\u4e2a
.java<\/code> \u6587\u4ef6\u91cc\u53ea\u80fd\u6709\u4e00\u4e2apublic<\/code> \u7c7b\u3002<\/li>\n\n\n\n- \u6587\u4ef6\u540d\u5fc5\u987b\u548c\u8fd9\u4e2a
public<\/code> \u7c7b\u540d\u4e00\u6a21\u4e00\u6837\uff08\u5927\u5c0f\u5199\u654f\u611f\uff09\u3002<\/li>\n\n\n\n- \u8fd9\u5c31\u50cf C \u8bed\u8a00\u91cc\uff0c\u5934\u6587\u4ef6\u901a\u5e38\u8981\u548c\u91cc\u9762\u7684\u4e3b\u8981\u7ed3\u6784\u4f53\u6216\u51fd\u6570\u5bf9\u5e94\u4e00\u6837\uff0c\u4f46 Java \u7ba1\u5f97\u66f4\u4e25<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
package com.zlj.test;
\/\/ package\uff1a \u8868\u793a\u5f53\u524d\u7684\u7c7b\u5b9a\u4e49\u5728\u54ea\u4e2a\u5305\u4e0b
\/\/ \u8fd9\u6bb5\u4ee3\u7801\u4e0d\u9700\u8981\u6211\u4eec\u81ea\u5df1\u5199\uff0c\u662fIDEA\u81ea\u52a8\u751f\u6210\u7684
\u200b
\/\/\u8868\u793a\u5b9a\u4e49\u4e00\u4e2a\u7c7b
\/\/class\uff1a\u8868\u793a\u5b9a\u4e49\u4e00\u4e2a\u7c7b\uff0c\u7c7b\u662fjava\u9879\u76ee\u4e2d\u6700\u57fa\u672c\u7684\u7ec4\u6210\u5355\u5143
\/\/HelloWorld\uff1a\u7c7b\u540d\uff0c\u7c7b\u540d\u5fc5\u987b\u4e0e\u6587\u4ef6\u540d\u4e00\u81f4
public class HelloWorld {
static void main() {
System.out.println(\"Hello World\");\/\/\u8f93\u51fa\u8bed\u53e5
}
}
\u200b<\/pre>\n\n\n\n\u4e3b\u65b9\u6cd5<\/h3>\n\n\n\n
\u4e3b\u65b9\u6cd5 (<\/strong>
public static void main(String[] args)<\/code>)<\/strong><\/p>\n\n\n\npublic static void main()<\/p>\n\n\n\n
\u5feb\u6377\u7f29\u5199psvm<\/strong><\/p>\n\n\n\n
\u8fd9\u662f\u4f60\u6700\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\uff0c\u4e5f\u662f Java \u6700\u6b7b\u677f\u7684\u5730\u65b9\u3002<\/p>\n\n\n\n
\u5728 Java \u4e2d\uff0c
public<\/code> \u7684\u610f\u601d\u662f\u201c\u516c\u5f00\u7684\u201d\u3002 \u5982\u679c\u4e00\u4e2a\u7c7b\u88ab\u58f0\u660e\u4e3apublic<\/code>\uff0c\u5c31\u610f\u5473\u7740\u5b83\u662f\u7ed9\u5916\u754c\u770b\u7684<\/strong>\uff0c\u662f\u7ed9\u5176\u4ed6\u7a0b\u5e8f\u8c03\u7528\u7684\u3002<\/p>\n\n\n\n- \n
public<\/code><\/strong>\uff1a\u516c\u5f00\u7684\u3002\u56e0\u4e3a JVM\uff08Java \u865a\u62df\u673a\uff09\u662f\u4ece\u5916\u9762\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5\u7684\uff0c\u6240\u4ee5\u5b83\u5fc5\u987b\u516c\u5f00\u3002<\/li>\n\n\n\nstatic<\/code><\/strong>\uff1a\u9759\u6001\u7684\u3002\u8fd9\u548c C \u8bed\u8a00\u91cc\u7684static<\/code> \u6709\u70b9\u50cf<\/strong>\uff0c\u610f\u5473\u7740\u5b83\u5c5e\u4e8e\u7c7b\u672c\u8eab\uff0c\u4e0d\u9700\u8981new<\/code> \u4e00\u4e2a\u5bf9\u8c61\u5c31\u80fd\u8fd0\u884c\u3002JVM \u542f\u52a8\u65f6\u8fd8\u6ca1\u521b\u5efa\u4efb\u4f55\u5bf9\u8c61\uff0c\u6240\u4ee5\u5165\u53e3\u5fc5\u987b\u662fstatic<\/code> \u7684\u3002<\/li>\n\n\n\nvoid<\/code><\/strong>\uff1a\u6ca1\u6709\u8fd4\u56de\u503c\u3002<\/li>\n\n\n\nmain<\/code><\/strong>\uff1a\u65b9\u6cd5\u540d\uff0cJVM \u53ea\u8ba4\u51c6\u8fd9\u4e2a\u540d\u5b57\u3002<\/li>\n\n\n\nString[] args<\/code>\u3002\u8fd9\u662f\u547d\u4ee4\u884c\u53c2\u6570\u3002- \u5728 C \u8bed\u8a00\u91cc\uff0c
main<\/code> \u51fd\u6570\u901a\u5e38\u5199\u6210int main(int argc, char *argv[])<\/code>\u3002<\/li>- \u5728 Java \u91cc\uff0c\u5b83\u628a\u53c2\u6570\u5c01\u88c5\u6210\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4
String[] args<\/code>\u3002\u54ea\u6015\u4f60\u4e0d\u7528\u53c2\u6570\uff0c\u8fd9\u4e2a\u683c\u5f0f\u4e5f\u5fc5\u987b\u5199\u4e0a\uff0c\u5426\u5219 JVM \u4f1a\u8ba4\u4e3a\u201c\u627e\u4e0d\u5230\u5165\u53e3\u201d\uff0c\u76f4\u63a5\u62a5\u9519\u3002<\/li><\/ul>\u4f46public\u5bf9\u4e8eJava25\u6765\u8bf4\u662f\u591a\u4f59\u7684\uff0c\u65b0\u7248\u901a\u5e38\u76f4\u63a5\u5199\u6210static void main() {
}<\/li>\n<\/ul>\n\n\n\n![\"image-20260515190528250\"\/](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/figure>\n\n\n\n\u8bed\u6cd5\u7bc7<\/h2>\n\n\n\n
\u5b57\u9762\u91cf<\/h3>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u7ec3\u4e60 \u8f93\u51fa\u6050\u9f99\u7684\u4fe1\u606f\uff1a\u5e74\u9f84 \u4f53\u91cd \u6027\u522b<\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u53d8\u91cf<\/h3>\n\n\n\n
\u53d8\u91cf\u662f\u5b58\u50a8\u6570\u636e\u7684\u5c0f\u7a7a\u95f4\uff0c\u800c\u4e0d\u662f\u6570\u636e<\/p>\n\n\n\n
\u5b9a\u4e49\u683c\u5f0f\u5982\u4e0b<\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u53d8\u91cf\u5b9a\u4e49\u53ca\u6570\u636e\u7c7b\u578b\u4e0eC\u8bed\u8a00\u4e00\u6837\u7684<\/p>\n\n\n\n
\u7ec3\u4e60 \u8f93\u51fa\u4f59\u989d<\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u53d8\u91cf\u7684\u6ce8\u610f\u4e8b\u9879<\/p>\n\n\n\n
- \n
- \u53ea\u80fd\u5b58\u4e00\u4e2a\u503c<\/li>\n\n\n\n
- \u53d8\u91cf\u540d\u4e0d\u5141\u8bb8\u91cd\u590d\u5b9a\u4e49<\/li>\n\n\n\n
- \u53d8\u91cf\u5728\u4f7f\u7528\u4e4b\u524d\u4e00\u5b9a\u8981\u8fdb\u884c\u8d4b\u503c\uff08\u53d8\u91cfa\u6ca1\u6709\u5b58\u6570\u636e\u65f6\u4e0d\u80fd\u8f93\u51faa\uff0c\u65e0\u610f\u4e49\uff09<\/li>\n\n\n\n
- \u4e00\u6761\u8bed\u53e5\u53ef\u4ee5\u5b9a\u4e49\u591a\u4e2a\u53d8\u91cf\uff0c\u4e5f\u53ef\u4ee5\u8fde\u7eed\u8d4b\u503c\uff08a=b=c=d=10\uff09<\/li>\n<\/ul>\n\n\n\n
\u8ba1\u7b97\u673a\u5b58\u50a8\u89c4\u5219<\/h3>\n\n\n\n
\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u4efb\u610f\u6570\u636e\u90fd\u662f\u4ee5\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\u6765\u5b58\u50a8\u7684<\/p>\n\n\n\n
\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u6709\u4e0d\u540c\u7684\u5b58\u50a8\u5355\u5143<\/p>\n\n\n\n
\u5b57\u8282\u662f\u6700\u5c0f\u7684\u5b58\u50a8\u5355\u5143\uff0c1\u5b57\u8282=8bit<\/p>\n\n\n\n
\u5728Java\u4e2d\uff0cint\u7c7b\u578b\u53604\u4e2a\u5b57\u8282\/32\u4e2abit\u4f4d<\/p>\n\n\n\n
\u6570\u636e\u7c7b\u578b<\/h3>\n\n\n\n
\u6574\u6570<\/th> \u53d6\u503c\u8303\u56f4<\/th> \u5185\u5b58\uff08\u5b57\u8282\uff09<\/th><\/tr><\/thead> byte<\/td> -128~127<\/td> 1<\/td><\/tr> short<\/td> -32768~32767<\/td> 2<\/td><\/tr> int<\/td> -2147483648~2147483647\uff0810\u4f4d\u6570\uff09<\/td> 4<\/td><\/tr> long<\/td> 19\u4f4d\u6570<\/td> 8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \u5728\u8ba1\u7b97\u673a\u8868\u793a56<\/p>\n\n\n\n
\u82e5\u4e3abyte\u7c7b\u578b\uff0c\u5219\u662f00111000<\/p>\n\n\n\n
\u82e5\u4e3ashort\u7c7b\u578b\uff0c\u5219\u662f00000000 00111000<\/p>\n\n\n\n
\/\/1.\u5b9a\u4e49byte\u7c7b\u578b\u7684\u53d8\u91cf
byte b=127;
System.out.println(b);
\/\/2.\u5b9a\u4e49short\u7c7b\u578b\u7684\u53d8\u91cf
short s=32767;
System.out.println(s);
\/\/3.\u5b9a\u4e49int\u7c7b\u578b\u7684\u53d8\u91cf
int i=200;
System.out.println(i);
\/\/4.\u5b9a\u4e49long\u7c7b\u578b\u7684\u53d8\u91cf
\/\/long\u7c7b\u578b\u6570\u636e\u5fc5\u987b\u4ee5L\u6216l\u7ed3\u5c3e\uff1a`long l=10000000000L;`
long l=10000000000L;
System.out.println(l);<\/pre>\n\n\n\n\u6d6e\u70b9\u6570<\/th> \u53d6\u503c\u8303\u56f4<\/th> \u5185\u5b58\uff08\u5b57\u8282\uff09<\/th><\/tr><\/thead> float<\/td> -3.402 *10^38~3.402 *10^38<\/td> 4<\/td><\/tr> double<\/td> -1.797 *10^308~1.797 *10^308<\/td> 8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \/\/\u5b9a\u4e49float\u7c7b\u578b\u7684\u53d8\u91cf
\/\/\u6d6e\u70b9\u6570\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u5fc5\u987b\u4ee5f\u6216F\u7ed3\u5c3e\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u5199
float f=1.1f;
System.out.println(f);
\/\/\u5b9a\u4e49double\u7c7b\u578b\u7684\u53d8\u91cf
double d=1.1;
System.out.println(d);<\/pre>\n\n\n\n\u5b57\u7b26\u578b\uff1achar \u4e8c\u4e2a\u5b57\u8282 \u2018\u597d\u2019 \u2018a\u2019<\/p>\n\n\n\n
char c='\u4e2d';
System.out.println(c);<\/pre>\n\n\n\n\u6ce8\u610f\uff1aC\u8bed\u8a00\u4e2d\u7684char\u4e0d\u80fd\u5b58\u50a8\u4e2d\u6587\uff0c\u4f46\u662fJava\u91cc\u53ef\u4ee5<\/strong><\/p>\n\n\n\n
\u5e03\u5c14\u578b\uff1aboolean \u4e00\u4e2a\u5b57\u8282 true\/false<\/p>\n\n\n\n
boolean bb=ture;
System.out.println(bb);\/\/\u6253\u5370\u51fa\u7684\u5c31\u662fture\uff0c\u4f46\u5728C\u8bed\u8a00\u4e2d\u5c31\u662f1\/0<\/pre>\n\n\n\nstring\u3001\u6570\u7ec4\u90fd\u662f\u5f15\u7528\u6570\u636e\u7c7b\u578b\uff0c\u5176\u4ed6\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
\u6807\u8bc6\u7b26<\/h3>\n\n\n\n
\u4ee3\u7801\u4e2d\u6240\u6709\u6211\u4eec\u81ea\u5df1\u8d77\u7684\u540d\u5b57\u3002\u6bd4\u5982\u7c7b\u540d\u3001\u53d8\u91cf\u540d\u3001\u65b9\u6cd5\u540d<\/p>\n\n\n\n
\u5176\u547d\u540d\u6709\u4ee5\u4e0b\u786c\u6027\u8981\u6c42<\/p>\n\n\n\n
- \n
- \u7531\u6570\u5b57\u3001\u5b57\u6bcd\u3001\u4e0b\u5212\u7ebf__\u3001\u7f8e\u5143\u7b26\uffe5\u7ec4\u6210<\/li>\n\n\n\n
- \u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934<\/li>\n\n\n\n
- \u4e0d\u80fd\u662f\u5173\u952e\u5b57<\/li>\n\n\n\n
- \u533a\u5206\u5927\u5c0f\u5199<\/li>\n<\/ul>\n\n\n\n
\u9a7c\u5cf0\u547d\u540d\u6cd5<\/p>\n\n\n\n
- \n
- \u5c0f\u9a7c\u5cf0\u547d\u540d\u6cd5 (lowerCamelCase)<\/strong>\n
- \n
- \u89c4\u5219<\/strong>\uff1a\u7b2c\u4e00\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u5c0f\u5199\uff0c\u540e\u7eed\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u5927\u5199\u3002<\/li>\n\n\n\n
- \u7528\u9014<\/strong>\uff1a\u5728 Java\u3001JavaScript \u7b49\u8bed\u8a00\u4e2d\uff0c\u901a\u5e38\u7528\u4e8e\u53d8\u91cf\u540d\u548c\u65b9\u6cd5\u540d<\/strong>\u3002<\/li>\n\n\n\n
- \u793a\u4f8b<\/strong>\uff1a
userName<\/code>,calculateTotalPrice<\/code>,getStudentInfo<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n- \u5927\u9a7c\u5cf0\u547d\u540d\u6cd5 (UpperCamelCase \/ PascalCase)<\/strong>\n
- \n
- \u89c4\u5219<\/strong>\uff1a\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u90fd\u5927\u5199\u3002<\/li>\n\n\n\n
- \u7528\u9014<\/strong>\uff1a\u5728 Java \u7b49\u8bed\u8a00\u4e2d\uff0c\u901a\u5e38\u7528\u4e8e\u7c7b\u540d\u3001\u63a5\u53e3\u540d<\/strong>\u3002<\/li>\n\n\n\n
- \u793a\u4f8b<\/strong>\uff1a
StudentInfo<\/code>,UserService<\/code>,DataProcessor<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n\u952e\u76d8\u5f55\u5165<\/h3>\n\n\n\n
\u76f8\u5f53\u4e8ec\u8bed\u8a00\u91cc\u7684scanf\uff0c\u4f46Java\u9700\u8981\u5148\u521b\u5efa\u4e00\u4e2aScanner\u5bf9\u8c61<\/p>\n\n\n\n
package com.zlj.test;
import java.util.Scanner;
public class demo09 {
static void main() {
\/*
\u952e\u76d8\u5f55\u5165\uff1a
1. \u521b\u5efaScanner\u5bf9\u8c61\uff08\u521b\u5efa\u4e86\u4e00\u4e2aScanner\u7c7b\u578b\u7684\u53d8\u91cf\uff09
2. \u5f55\u5165\u6570\u636e
3. \u8f93\u51fa\u6570\u636e
4. \u5173\u95edScanner\u5bf9\u8c61
\u5c31\u662f\u8981\u627e\u5230Scanner\u8fd9\u4e2a\u6253\u5de5\u4eba\uff0c\u7136\u540e\u8ba9\u5b83\u5e72\u6d3b
*\/
\/\/Scanner\u4e3a\u7c7b\u540d\uff08\u56fa\u5b9a\uff09 sc\u4e3a\u53d8\u91cf\u540d\uff08\u81ea\u5b9a\u4e49\uff09
\/\/\u53f3\u8fb9\u7684\u8d4b\u503c\u8868\u793a\u201c\u4ece\u952e\u76d8\u83b7\u53d6\u8f93\u5165\u201d
Scanner sc = new Scanner(System.in);
\/\/\u63a5\u6536\u952e\u76d8\u5f55\u5165\u7684\u6574\u6570
\/\/.nextInt\uff08\uff09\u4e3a\u65b9\u6cd5\u540d\uff0c\u8bfb\u53d6\u4e00\u4e2a\u6574\u6570\uff0c\u662f\u89c4\u5b9a\u597d\u7684\u529f\u80fd
int a = sc.nextInt();
System.out.println(a);
\/\/\u63a5\u6536\u952e\u76d8\u5f55\u5165\u7684double
double b = sc.nextDouble();
System.out.println(b);
\/\/\u63a5\u6536\u952e\u76d8\u5f55\u5165\u7684\u5b57\u7b26\u4e32
String c = sc.next(); \/\/\u4ee5\u7a7a\u683c\u4e3a\u7ed3\u675f\u6807\u5fd7 \u6362\u884c\u518d\u8f93\u5165\u5403\u7684\u662f\u7f13\u51b2\u533a\u7684\u6362\u884c \u663e\u793a\u7a7a\u683c \u5e94\u8be5\u7528String c=sc.nextline() \u4ee5\u56de\u8f66\u4e3a\u7ed3\u675f\u6807\u5fd7
System.out.println(c);
}
}<\/pre>\n\n\n\nprintln\u8f93\u51fa<\/h3>\n\n\n\n
\/\/\u5b57\u7b26\u4e32\u8f93\u51fa
System.out.println(\"\u4f60\u597d\uff0c\u4e16\u754c\uff01\");
\/\/\u503c\u8f93\u51fa
int Num=100;
System.out.prinln(Num);
\/\/\u6df7\u5408\u8f93\u51fa
int num1 = 10;
int num2 = 20;
System.out.println(\"\u7b2c\u4e00\u4e2a\u6570\u662f\uff1a\" + num1 + \"\uff0c\u7b2c\u4e8c\u4e2a\u6570\u662f\uff1a\" + num2);
\/\/ \u4e5f\u53ef\u4ee5\u5728\u91cc\u9762\u76f4\u63a5\u505a\u6570\u5b66\u8fd0\u7b97\uff08\u8bb0\u5f97\u52a0\u62ec\u53f7\uff09
System.out.println(\"\u5b83\u4eec\u7684\u548c\u662f\uff1a\" + (num1 + num2));<\/pre>\n\n\n\n\u6587\u5b57\u4e0e\u6570\u5b57\u95f4\u7684
+<\/code> \u53f7\u4e0d\u53eb\u52a0\u6cd5\uff0c\u53eb\u201c\u62fc\u63a5\u201d\u3002<\/strong> \u5b83\u7684\u4f5c\u7528\u662f\u628a\u524d\u540e\u7684\u5185\u5bb9\u7c98\u6210\u4e00\u6761\u957f\u957f\u7684\u5b57\u7b26\u4e32\u3002\u5feb\u6377\u7f29\u5199sout<\/code><\/p>\n\n\n\n\u7c7b\u578b\u8f6c\u6362<\/h3>\n\n\n\n
\u9690\u5f0f\u8f6c\u6362<\/h4>\n\n\n\n
\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\u8fdb\u884c\u8ba1\u7b97\uff0c\u9ed8\u8ba4\u91c7\u53d6\u9690\u5f0f\u8f6c\u6362\uff0cjava\u81ea\u52a8\u8f6c\u6362\uff0c\u65e0\u9700\u6211\u4eec\u5199\u4ee3\u7801<\/p>\n\n\n\n
\u5982\u6709byte short\u7c7b\u578b\u7684\u6570\u636e\uff0c\u5148\u63d0\u5347\u4e3aint\u7c7b\u578b<\/p>\n\n\n\n
\u628a\u53d6\u503c\u8303\u56f4\u5c0f\u7684\u63d0\u5347\u4e3a\u53d6\u503c\u8303\u56f4\u5927\u7684\uff0c\u518d\u8fdb\u884c\u8fd0\u7b97<\/p>\n\n\n\n
\u53d8\u91cf<\/th> \u7c7b\u578b<\/th><\/tr><\/thead> a<\/td> byte<\/td><\/tr> b<\/td> byte<\/td><\/tr> c=a+b<\/td> int<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \u53d8\u91cf<\/th> \u7c7b\u578b<\/th><\/tr><\/thead> a<\/td> double<\/td><\/tr> b<\/td> byte<\/td><\/tr> c=a+b<\/td> double<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \u5f3a\u5236\u8f6c\u6362<\/h4>\n\n\n\n
\u5f3a\u5236\u8f6c\u6362\u4e0d\u4f1a\u81ea\u52a8\u89e6\u53d1\uff0c\u9700\u8981\u624b\u52a8\u4e66\u5199\u4ee3\u7801<\/p>\n\n\n\n
\u4e66\u5199\u683c\u5f0f\uff1a\u76ee\u6807\u6570\u636e\u7c7b\u578b \u53d8\u91cf\u540d=\uff08\u76ee\u6807\u6570\u636e\u7c7b\u578b\uff09\u88ab\u5f3a\u8f6c\u7684\u6570\u636e;<\/p>\n\n\n\n
int a=10;
byte b=(byte)a;<\/pre>\n\n\n\n\u4e0d\u80fd\u628a\u5927\u7c7b\u578b\u53d8\u91cf\u8d4b\u503c\u7ed9\u5c0f\u7c7b\u578b<\/p>\n\n\n\n
\u4f8b\u5982<\/p>\n\n\n\n
short a=10;
short b=10;
byte c=a+b;<\/pre>\n\n\n\na+b\u4f1a\u9690\u5f62\u8f6c\u6362\u4e3aint\u7c7b\u578b\uff0c\u4e0a\u9762\u4ee3\u7801\u8bd5\u56fe\u628aint\u7c7b\u578b\u53d8\u91cf\u8d4b\u503c\u7ed9byte\u7c7b\u578b\u53d8\u91cf\uff0c\u4f1a\u51fa\u73b0\u62a5\u9519\uff0c\u867d\u7136byte\u8db3\u4ee5\u50a8\u5b5820\u8fd9\u4e2a\u6570\uff0c\u4f46\u662f\u7f16\u8bd1\u5668\u4e3a\u4e86\u5b89\u5168\u8d77\u89c1\uff0c\u8ba4\u4e3a
int<\/code> \u53d8\u91cf\u6709\u53ef\u80fd<\/strong>\u8d85\u51fabyte<\/code> \u7684\u8303\u56f4\uff0c\u6240\u4ee5\u5b83\u5f3a\u5236\u8981\u6c42\u4f60\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/strong>\u3002\u5fc5\u987b\u5199\u6210byte c=(byte)a+b;<\/code><\/p>\n\n\n\n\u6570\u636e\u7c7b\u578b\u7684\u8303\u56f4\u5927\u5c0f\u987a\u5e8f\u662f\uff1a
double<\/code> >float<\/code> >long<\/code> >int<\/code><\/strong> >char<\/code><\/strong> >short<\/code> >byte<\/code>\u3002<\/p>\n\n\n\n- \n
- \u4ece\u5c0f\u7ed9\u5927<\/strong>\uff08\u6bd4\u5982
int<\/code> \u7ed9long<\/code>\uff09\uff1a\u5b89\u5168\uff0c\u76f4\u63a5\u7ed9\uff08\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\uff09\u3002<\/li>\n\n\n\n- \u4ece\u5927\u7ed9\u5c0f<\/strong>\uff08\u6bd4\u5982
int<\/code> \u7ed9char<\/code>\uff09\uff1a\u5371\u9669\uff0c\u53ef\u80fd\u4f1a\u4e22\u6570\u636e\uff0c\u5fc5\u987b\u52a0(char)<\/code> \u5f3a\u8f6c\uff08\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff09\u3002<\/li>\n<\/ul>\n\n\n\n\u4f46\u662f\u5f3a\u5236\u8f6c\u6362\u6709\u5f0a\u7aef\uff1a\u6709\u53ef\u80fd\u4f1a\u6539\u53d8\u539f\u6709\u6570\u636e<\/strong>\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n
int\u7c7b\u578b\u7684300\uff1a\u4e8c\u8fdb\u523600000000 00000000 00000001 00101100<\/p>\n\n\n\n
\u628a\u5b83\u5f3a\u5236\u8f6c\u6362\u4e3abyte\uff0c\u5c31\u662f\u53bb\u6389\u524d\u9762\u4e09\u4e2a\u5b57\u8282 \u53d8\u4e3a00101100 \u5176\u5341\u8fdb\u5236\u662f44\u800c\u4e0d\u662f300<\/p>\n\n\n\n
\u6240\u4ee5\u6700\u597d\u5199\u6210
int c=a+b;<\/code><\/strong><\/p>\n\n\n\n\u5b57\u7b26\u8fd0\u7b97<\/h3>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u5927\u5199\u5b57\u6bcd=\u5c0f\u5199\u5b57\u6bcd-32\uff1b<\/p>\n\n\n\n
package com.zlj.test;
public class demo16 {
static void main() {
\/\/\u5927\u5199\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5c0f\u5199
char ch = 'A';
System.out.println((char)(ch + 32));
\/\/\u5c0f\u5199\u5b57\u6bcd\u8f6c\u6362\u4e3a\u5927\u5199
char ch1 = 'a';
System.out.println((char)(ch1 - 32));
}
}<\/pre>\n\n\n\n\u7591\u60d1\uff1achar\u65e2\u80fd\u8868\u793a\u6570\u5b57\uff0c\u53c8\u80fd\u8868\u793aASC\u7801\u5bf9\u5e94\u7684\u5b57\u7b26\uff0c\u90a3\u5b83\u5230\u5e95\u662f\u6570\u5b57\u8fd8\u662f\u5b57\u7b26<\/p>\n\n\n\n
public class CharSummary {
public static void main(String[] args) {
\/\/ --- 1. \u5b58\u50a8\u672c\u8d28\uff1a\u53ea\u5b58\u6570\u5b57 ---
\/\/ \u867d\u7136\u4ee3\u7801\u5199\u7684\u662f 'A'\uff0c\u4f46\u8ba1\u7b97\u673a\u5185\u5b58\u91cc\u5b9e\u9645\u5b58\u50a8\u7684\u662f\u6574\u6570 65 (ASCII\u7801)\u3002
\/\/ char \u7c7b\u578b\u53ea\u5360 2 \u4e2a\u5b57\u8282\uff0c\u7528\u6765\u5b58\u8fd9\u4e2a\u6574\u6570\u3002
char c = 'A';
\/\/ --- 2. \u663e\u793a\u89c4\u5219\uff1a\u770b\u7c7b\u578b\u7ffb\u8bd1 ---
\/\/ \u5f53\u53d8\u91cf\u7c7b\u578b\u662f char \u65f6\uff0cprintln \u4f1a\u81ea\u52a8\u53bb\u67e5\u8868\uff08ASCII\/Unicode\uff09\uff0c
\/\/ \u628a\u6570\u5b57 65 \u7ffb\u8bd1\u6210\u5b57\u7b26 'A' \u6253\u5370\u51fa\u6765\u3002
System.out.println(c); \/\/ \u8f93\u51fa: A
\/\/ --- 3. \u8fd0\u7b97\u89c4\u5219\uff1a\u8fd8\u539f\u6570\u5b57\u8eab\u4efd ---
\/\/ \u4e00\u65e6 char \u53c2\u4e0e\u6570\u5b66\u8fd0\u7b97\uff08+ - * \/\uff09\uff0cJava \u4f1a\u7acb\u5373\u628a\u5b83\u5f53\u4f5c\u6574\u6570\u5904\u7406\u3002
\/\/ \u8fd9\u91cc\u7684 c \u4f1a\u88ab\u89c6\u4e3a 65\uff0c\u800c\u4e0d\u662f 'A'\u3002
\/\/ \u4e14\u6839\u636e\u89c4\u5219\uff0cchar \u8fd0\u7b97\u65f6\u4f1a\u81ea\u52a8\u5347\u7ea7\u4e3a int \u7c7b\u578b\u3002
int result = c + 1; \/\/ \u76f8\u5f53\u4e8e 65 + 1 = 66
\/\/ \u56e0\u4e3a result \u662f int \u7c7b\u578b\uff0cprintln \u76f4\u63a5\u6253\u5370\u6570\u5b57\uff0c\u4e0d\u67e5\u8868\u3002
System.out.println(result); \/\/ \u8f93\u51fa: 66
\/\/ --- 4. \u8d4b\u503c\u89c4\u5219\uff1a\u5927\u7ed9\u5c0f\u9700\u5f3a\u8f6c ---
\/\/ c + 1 \u7684\u7ed3\u679c\u9ed8\u8ba4\u662f int \u7c7b\u578b\uff08\u6570\u5b57 66\uff09\u3002
\/\/ \u8bd5\u56fe\u628a int\uff08\u5927\u8303\u56f4\uff09\u8d4b\u503c\u7ed9 char\uff08\u5c0f\u8303\u56f4\uff09\uff0c\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519\u3002
\/\/ \u5fc5\u987b\u4f7f\u7528 (char) \u5f3a\u5236\u8f6c\u6362\uff0c\u544a\u8bc9\u7f16\u8bd1\u5668\u201c\u6211\u77e5\u9053\u6211\u5728\u505a\u4ec0\u4e48\u201d\u3002
char nextChar = (char) (c + 1);
\/\/ \u6b64\u65f6 nextChar \u5b58\u50a8\u7684\u662f\u6570\u5b57 66\u3002
\/\/ \u4f46\u56e0\u4e3a\u5b83\u7684\u7c7b\u578b\u662f char\uff0c\u6253\u5370\u65f6\u53c8\u4f1a\u67e5\u8868\uff0c\u663e\u793a\u4e3a 'B'\u3002
System.out.println(nextChar); \/\/ \u8f93\u51fa: B
}
}<\/pre>\n\n\n\nchar<\/code> \u662f\u6700\u7279\u6b8a\u7684\u7c7b\u578b\uff0c\u5b83\u65e2\u662f\u5b57\u7b26\uff0c\u4e5f\u662f\u6570\u5b57\u3002<\/p>\n\n\n\n- \n
- \u672c\u8d28<\/strong>\uff1a\u5b83\u5e95\u5c42\u5b58\u7684\u5c31\u662f\u4e00\u4e2a\u6570\u5b57<\/strong>\uff080 \u5230 65535\uff09\uff0c\u5bf9\u5e94\u7740ASCII \u7f16\u7801\u8868\u3002<\/li>\n\n\n\n
- \u4ec0\u4e48\u65f6\u5019\u662f\u5b57\u7b26\uff1f\n
- \n
- \u5f53\u4f60\u7528
System.out.println(c)<\/code> \u6253\u5370\u5b83\u65f6\uff0c\u6216\u8005\u8d4b\u503c\u7ed9\u53e6\u4e00\u4e2achar<\/code> \u65f6\uff0c\u5b83\u663e\u793a\u4e3a\u5b57\u7b26<\/strong>\uff08\u6bd4\u5982'A'<\/code>\uff09\u3002\u4e5f\u5c31\u662f\u6253\u5370char\u7c7b\u578b\uff0c\u65e0\u8bba\u4f60\u5199\u7684\u662fchar a=65\u8fd8\u662fchar a=\u2018A\u2019\uff0c\u53ea\u8981\u5b83\u662fchar\u7c7b\u578b\u90fd\u4f1a\u663e\u793a\u4e3a\u5b57\u7b26<\/li>\n<\/ul>\n<\/li>\n\n\n\n- \u4ec0\u4e48\u65f6\u5019\u662f\u6570\u5b57\uff1f\n
- \n
- \u5b83\u672c\u8d28\u5c31\u662f\u6570\u5b57\uff0c\u5f53\u4f60\u628a\u5b83\u53c2\u4e0e\u8fd0\u7b97\uff08
c + 1<\/code>\uff09\u65f6\uff0c\u6216\u8005\u5f3a\u5236\u8f6c\u4e3aint<\/code> \u65f6\uff0c\u5b83\u663e\u793a\u4e3a\u6570\u5b57<\/strong>\uff08\u6bd4\u598265<\/code>\uff09\u3002\u5173\u4e8e\u7b2c\u4e00\u79cd\u5f53char c=65\u65f6\u5982\u679c\u4f60\u5199\u7684\u662fchar a=c+1\u4f1a\u62a5\u9519\u3002\u5982\u679c\u662fchar a=(char)(c+1)\u65f6\uff0ca\u6253\u5370\u51fa\u6765\u5c31\u662f\u5b57\u7b26b\u3002\u5982\u679c\u662fint a=c+1\u65f6\uff0c\u5b83\u5c31\u53d8\u6210\u4e86\u6570\u5b57\uff0c\u4e0d\u518d\u662f\u5b57\u7b26<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n\u5b57\u7b26\u4e32\u62fc\u63a5\u8fd0\u7b97<\/h3>\n\n\n\n
\u8fd9\u5f20\u56fe\u8bb2\u6e05\u695a\u4e86 Java \u4e2d\u5b57\u7b26\u4e32\uff08String\uff09\u4e0e
+<\/code> \u53f7\u7684\u7279\u6b8a\u89c4\u5219\uff0c\u8fd9\u4e5f\u662f Java \u548c C \u8bed\u8a00\u6700\u5927\u7684\u533a\u522b\u4e4b\u4e00\u3002<\/p>\n\n\n\n\u6838\u5fc3\u539f\u5219<\/strong><\/p>\n\n\n\n
- \n
- \u53ea\u6709\u52a0\u6cd5<\/strong>\uff1a\u5b57\u7b26\u4e32\u53ea\u652f\u6301
+<\/code> \u64cd\u4f5c\uff0c\u4e0d\u652f\u6301-<\/code>\u3001*<\/code>\u3001\/<\/code>\u3002<\/li>\n\n\n\n- \u62fc\u63a5\u672c\u8d28<\/strong>\uff1a\u53ea\u8981
+<\/code> \u53f7\u4e24\u8fb9\u4efb\u610f\u4e00\u65b9\u662f\u5b57\u7b26\u4e32<\/strong>\uff0c\u5b83\u5c31\u53d8\u6210\u4e86\u201c\u8fde\u63a5\u5668\u201d\uff0c\u800c\u4e0d\u662f\u6570\u5b66\u52a0\u6cd5\u3002<\/li>\n\n\n\n- \u81ea\u52a8\u8f6c\u6362<\/strong>\uff1a\u975e\u5b57\u7b26\u4e32\u6570\u636e\uff08\u5982\u6570\u5b57\uff09\u4f1a\u88ab\u81ea\u52a8\u8f6c\u6210\u6587\u672c\u5f62\u5f0f\u8fde\u63a5\u3002<\/li>\n<\/ol>\n\n\n\n
\u8fd0\u7b97\u987a\u5e8f\uff08\u4ece\u5de6\u5230\u53f3\uff09<\/strong><\/p>\n\n\n\n
Java \u662f\u4e25\u683c\u6309\u7167\u4ece\u5de6\u5f80\u53f3<\/strong>\u7684\u987a\u5e8f\u6267\u884c\u7684\uff0c\u8fd9\u70b9\u975e\u5e38\u91cd\u8981\uff1a<\/p>\n\n\n\n
- \n
- \u6570\u5b57\u5728\u524d\uff0c\u5b57\u7b26\u4e32\u5728\u540e\uff1a\u5148\u7b97\u52a0\u6cd5\uff0c\u518d\u62fc\u63a5\u3002\n
- \n
10 + 8 + \"\u5c81\"<\/code> \u2192 \u5148\u7b9710+8<\/code> \u5f9718<\/code> \u2192 \u518d\u62fc\"\u5c81\"<\/code> \u2192 \u7ed3\u679c\"18\u5c81\"<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n- \u5b57\u7b26\u4e32\u5728\u4e2d\u95f4\uff1a\u524d\u9762\u7684\u62fc\u5b8c\uff0c\u540e\u9762\u7684\u63a5\u7740\u62fc\u3002\n
- \n
10 + 8 + \"\u5c81\" + 1 + 2<\/code><\/li>\n\n\n\n- \u7b2c\u4e00\u6b65\uff1a
18 + \"\u5c81\"<\/code> \u2192\"18\u5c81\"<\/code><\/li>\n\n\n\n- \u7b2c\u4e8c\u6b65\uff1a
\"18\u5c81\" + 1<\/code> \u2192\"18\u5c811\"<\/code><\/li>\n\n\n\n- \u7b2c\u4e09\u6b65\uff1a
\"18\u5c811\" + 2<\/code> \u2192\"18\u5c8112\"<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n\u8fd0\u7b97\u7b26<\/h3>\n\n\n\n
\u7b97\u6570\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
+ – * \/ %<\/p>\n\n\n\n
\u4e0eC\u8bed\u8a00\u4e00\u6837<\/p>\n\n\n\n
\u6574\u6570\uff1a\u6574\u6570\u76f8\u9664\u7ed3\u679c\u8fd8\u662f\u6574\u6570\uff0c\u5176\u4ed6\u8fd0\u7b97\u8ddf\u6570\u5b66\u4e2d\u662f\u4e00\u6a21\u4e00\u6837\u7684<\/p>\n\n\n\n
\u5c0f\u6570\uff1a\u5c0f\u6570\u76f4\u63a5\u53c2\u4e0e\u8ba1\u7b97\uff0c\u7ed3\u679c\u6709\u53ef\u80fd\u4e0d\u7cbe\u786e\u7684<\/p>\n\n\n\n
\u81ea\u589e\u81ea\u51cf\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
\u4e0ec\u8bed\u8a00\u4e00\u6837\u7684\uff0c\u4e0d\u60f3\u8bf4\uff0c\u7565<\/p>\n\n\n\n
\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
\u5176\u5b9e\u4e5f\u4e0d\u60f3\u8bf4\uff0c\u4f46\u6211\u8868\u683c\u763e\u72af\u4e86<\/p>\n\n\n\n
\u7b26\u53f7<\/th> \u8bf4\u660e<\/th> \u4e3e\u4f8b<\/th><\/tr><\/thead> =<\/td> \u76f4\u63a5\u8d4b\u503c<\/td> int a=10\uff0c\u5c0610\u8d4b\u503c\u7ed9a<\/td><\/tr> +=<\/td> \u52a0\u540e\u8d4b\u503c<\/td> a+=b\uff0c\u5c06a+b\u7684\u503c\u7ed9a<\/td><\/tr> -=<\/td> \u51cf\u540e\u8d4b\u503c<\/td> a-=b\uff0c\u5c06a-b\u7684\u503c\u7ed9a<\/td><\/tr> *=<\/td> \u4e58\u540e\u8d4b\u503c<\/td> a*=b,\u5c06a\u00d7b\u7684\u503c\u7ed9a<\/td><\/tr> \/=<\/td> \u9664\u540e\u8d4b\u503c<\/td> a\/=b\uff0c\u5c06a\u00f7b\u7684\u5546\u7ed9a<\/td><\/tr> %=<\/td> \u53d6\u4f59\u8d4b\u503c<\/td> a%=b\uff0c\u5c06a\u00f7b\u7684\u4f59\u6570\u7ed9a<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \u5173\u7cfb\/\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u6b64\u5904\u4e0ec\u8bed\u8a00\u552f\u4e00\u7684\u4e0d\u540c\u662f\u7ed3\u679c\u7c7b\u578b\u662f
boolean<\/code>\uff08\u5e03\u5c14\u503c\uff09<\/strong>true\u6216false\uff0c\u4f46c\u8bed\u8a00\u7ed3\u679c\u7c7b\u578b\u662fint\uff08\u6574\u6570\uff091\u62160<\/p>\n\n\n\n\u903b\u8f91\u8fd0\u7b97\u7b26<\/h4>\n\n\n\n
<\/div><\/figure>\n\n\n\n- \n
&&<\/code> (\u77ed\u8def\u4e0e)<\/strong>\uff1a\u5982\u679c\u5de6\u8fb9\u662f\u5047\uff08C \u662f 0\uff0cJava \u662f false\uff09\uff0c\u53f3\u8fb9\u6839\u672c\u4e0d\u4f1a\u6267\u884c<\/strong>\u3002<\/li>\n\n\n\n||<\/code> (\u77ed\u8def\u6216)<\/strong>\uff1a\u5982\u679c\u5de6\u8fb9\u662f\u771f\uff08C \u662f 1\uff0cJava \u662f true\uff09\uff0c\u53f3\u8fb9\u6839\u672c\u4e0d\u4f1a\u6267\u884c<\/strong>\u3002<\/li>\n\n\n\n
- \u7b2c\u4e00\u6b65\uff1a
- \u5b57\u7b26\u4e32\u5728\u4e2d\u95f4\uff1a\u524d\u9762\u7684\u62fc\u5b8c\uff0c\u540e\u9762\u7684\u63a5\u7740\u62fc\u3002\n
- \u62fc\u63a5\u672c\u8d28<\/strong>\uff1a\u53ea\u8981
- \u53ea\u6709\u52a0\u6cd5<\/strong>\uff1a\u5b57\u7b26\u4e32\u53ea\u652f\u6301
- \u4ec0\u4e48\u65f6\u5019\u662f\u6570\u5b57\uff1f\n
- \u4ec0\u4e48\u65f6\u5019\u662f\u5b57\u7b26\uff1f\n
- \u4ece\u5927\u7ed9\u5c0f<\/strong>\uff08\u6bd4\u5982
- \u7528\u9014<\/strong>\uff1a\u5728 Java \u7b49\u8bed\u8a00\u4e2d\uff0c\u901a\u5e38\u7528\u4e8e\u7c7b\u540d\u3001\u63a5\u53e3\u540d<\/strong>\u3002<\/li>\n\n\n\n
- \u7528\u9014<\/strong>\uff1a\u5728 Java\u3001JavaScript \u7b49\u8bed\u8a00\u4e2d\uff0c\u901a\u5e38\u7528\u4e8e\u53d8\u91cf\u540d\u548c\u65b9\u6cd5\u540d<\/strong>\u3002<\/li>\n\n\n\n
- \u89c4\u5219<\/strong>\uff1a\u7b2c\u4e00\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u5c0f\u5199\uff0c\u540e\u7eed\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u5927\u5199\u3002<\/li>\n\n\n\n
- \u5c0f\u9a7c\u5cf0\u547d\u540d\u6cd5 (lowerCamelCase)<\/strong>\n
- \u5728 Java \u91cc\uff0c\u5b83\u628a\u53c2\u6570\u5c01\u88c5\u6210\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4
- \u6587\u4ef6\u540d\u5fc5\u987b\u548c\u8fd9\u4e2a
![\"image-20260515190528250\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/image-20260515190528250.png\")
<\/div><\/figure>\n\n\n\n![\"image-20260504162714309\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/image-20260504162714309.png\")
<\/div><\/figure>\n\n\n\n![\"image-20260504164039440\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/image-20260504164039440.png\")
<\/div><\/figure>\n\n\n\n![\"6e60956334501437dd69eaa19894d54c\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/6e60956334501437dd69eaa19894d54c.png\")
<\/div><\/figure>\n\n\n\n![\"8b35c36a04aa7b2f929989c73f713cf4\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/8b35c36a04aa7b2f929989c73f713cf4.png\")
<\/div><\/figure>\n\n\n\n![\"image-20260507201232736\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/image-20260507201232736.png\")
<\/div><\/figure>\n\n\n\n![\"image-20260507211626909\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/image-20260507211626909.png\")
<\/div><\/figure>\n\n\n\n![\"image-20260507212045183\"\/](\"https:\/\/cdn.jsdelivr.net\/gh\/RainyBule\/blog_images@main\/images\/image-20260507212045183.png\")
<\/div><\/figure>\n\n\n\n