请教两个简单的Java程序？

import java.util.Scanner

/**

* @Author: Cool_Wu

* @Date: 2020-11-02 21:26

*

public class Test {

 public static void main(String[] args) {

     getInteger()

     getReverseInteger()

 }

 private static void getInteger() {

     Scanner scanner = new Scanner(System.in)

     System.out.println("请输入一个整数：")

     int num = scanner.nextInt()

     System.out.println(num)

 }

private static void getReverseInteger() {

     Scanner scanner = new Scanner(System.in)

     System.out.println("请输入一个整数：")

     String num = scanner.next()

     char[] chars = num.toCharArray()

     int[] nums = new int[chars.length]

     for (int i = 0i <chars.lengthi++) {

         nums[chars.length-1-i] = Integer.parseInt(String.valueOf(chars[i]))

     }

     for (int result : nums) {

         System.out.print(result)

     }

 }

}

运行结果

你想要什么程序呢？我给你一个示例，将一个字符串里面的大写字母转成小写字母，或者将一个字符串的小写字母转成大写字母：

import java.util.Scanner

public class ToUpAndLow {

private static void ToUper(String str){

char strInput = 0

int num = 0

String outPutStr = ""

for (int i = 0i <str.length()i++) {

strInput = str.substring(i,i + 1).charAt(0)

if(strInput >= 97 &&strInput <= 122){

num = strInput - 32

outPutStr += String.valueOf((char)num)

} else {

outPutStr += String.valueOf((char)strInput)

}

}

System.out.println("该字符串的大写形式是：" + outPutStr)

}

private static void ToLower(String str){

char strInput = 0

int num = 0

String outPutStr = ""

for (int i = 0i <str.length()i++) {

strInput = str.substring(i,i + 1).charAt(0)

if(strInput >= 65 &&strInput <= 90){

num = strInput + 32

outPutStr += String.valueOf((char)num)

} else {

outPutStr += String.valueOf((char)strInput)

}

}

System.out.println("该字符串的小写形式是：" + outPutStr)

}

public static void main(String[] args) {

System.out.print("请输入要转换的字符串：")

String inputStr = new Scanner(System.in).next()

ToUper(inputStr)

ToLower(inputStr)

}

}

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