Java - 随笔分类(第3页) - 胖豆芽

扩容数组

摘要：最后打印的值需要在同一作用域里有定义 int [] 数组= new int[长度] import java.util.Scanner; public class For02{ public static void main(String[] args){ Scanner myScanner = ne 阅读全文

posted @ 2025-04-27 18:22 胖豆芽阅读(3) 评论(0) 推荐(0)

反转数组

摘要：新数组 arr2[i]=arr1[arr1.length-1-i] 要减去1 否则超出范围 import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanne 阅读全文

posted @ 2025-04-27 17:44 胖豆芽阅读(6) 评论(0) 推荐(0)

复制一个数组

摘要：1.开辟一个新的空间 2.将旧数组内的数值赋值到新数组中 import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(S 阅读全文

posted @ 2025-04-27 17:37 胖豆芽阅读(8) 评论(0) 推荐(0)

数组是复制的是地址，不是具体的数值

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posted @ 2025-04-27 17:29 胖豆芽阅读(4) 评论(0) 推荐(0)

求数组里最大值

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System.out.println 阅读全文

posted @ 2025-04-27 16:51 胖豆芽阅读(4) 评论(0) 推荐(0)

冒泡排序

摘要：第一层前后比较后的结果 4 9 10 23 -1 最小的值已经排到了最后面再次循环之后将第二个小的找到拍到倒数第二的位置 import java.util.Scanner; public class For02{ public static void main(String[] args){ / 阅读全文

posted @ 2025-04-27 16:03 胖豆芽阅读(4) 评论(0) 推荐(0)

数组写26个大写字母 (char)65 对应A

摘要：将97转为 a XX=(char)97； A对应的是65 import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(S 阅读全文

posted @ 2025-04-27 15:13 胖豆芽阅读(12) 评论(0) 推荐(0)

数组静态数组 int[] arr={1,2,3}; 动态数组 int arr[]; arr = new int[3]; 或者 int arr[]=new int[3];]

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System.out.println 阅读全文

posted @ 2025-04-27 14:45 胖豆芽阅读(17) 评论(0) 推荐(0)

break continue return

摘要：阅读全文

posted @ 2025-04-27 14:33 胖豆芽阅读(6) 评论(0) 推荐(0)

求1+(1+2)+(1+2+3)+...+(1+2+3..+100)

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System.out.println 阅读全文

posted @ 2025-04-27 14:04 胖豆芽阅读(25) 评论(0) 推荐(0)

求1-1/2+1/3.....1/100

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System.out.println 阅读全文

posted @ 2025-04-27 13:58 胖豆芽阅读(8) 评论(0) 推荐(0)

输出a到z Z到A

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System.out.println 阅读全文

posted @ 2025-04-27 13:44 胖豆芽阅读(7) 评论(0) 推荐(0)

水仙花

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ Scanner myScanner = new Scanner(System.in); System.out.println(" 阅读全文

posted @ 2025-04-27 12:37 胖豆芽阅读(6) 评论(0) 推荐(0)

判断闰年

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ Scanner myScanner = new Scanner(System.in); System.out.println(" 阅读全文

posted @ 2025-04-27 11:17 胖豆芽阅读(8) 评论(0) 推荐(0)

if(条件){执行内容}

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ Scanner myScanner = new Scanner(System.in); System.out.println(" 阅读全文

posted @ 2025-04-27 11:09 胖豆芽阅读(3) 评论(0) 推荐(0)

解

摘要：先简化一下打印两排星星 import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System 阅读全文

posted @ 2025-04-25 16:07 胖豆芽阅读(7) 评论(0) 推荐(0)

图解return

摘要：再循环里的话，跳出本循环；如果在main方法的话直接结束程序 import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scann 阅读全文

posted @ 2025-04-25 14:27 胖豆芽阅读(5) 评论(0) 推荐(0)

图解continue 理解默认和指定跳出位置

摘要：默认跳出内循环 import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System.out 阅读全文

posted @ 2025-04-25 13:13 胖豆芽阅读(8) 评论(0) 推荐(0)

图解continue 所以如果将i++ 放在continue前面就会避免死循环

摘要：import java.util.Scanner; public class For02{ public static void main(String[] args){ //Scanner myScanner = new Scanner(System.in); System.out.println 阅读全文

posted @ 2025-04-25 12:34 胖豆芽阅读(9) 评论(0) 推荐(0)

break练习2：登录三次验证机会

摘要：犯的错字符验证是否正确使用：变量.equals("字符串") 键盘输入字符串 String 变量 = myScanner.next(); import java.util.Scanner; public class For02{ public static void main(String[] 阅读全文

posted @ 2025-04-25 11:55 胖豆芽阅读(6) 评论(0) 推荐(0)

随笔分类 - Java

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