Java implements converting uppercase letters to lowercase letters

Example:

String str = "AbC";

Convert all letters in the string to lowercase:

System.out.println(str.toLowerCase());

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Other methods:

import java.util.Scanner;
public class Exercies3 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.print("输入大写字母:");
        char ch = scan.next().charAt(0);
        while (ch <&#39;A&#39;|| ch > &#39;Z&#39;)
        {
            System.out.print("输入错误,请重新输入：");
            ch =scan.next().charAt(0);
        }
        ch = (char) (ch + 32);//根据ASCII码，大写字母变为小写字母只需要+32即可
        System.out.print("小写字母:" + ch);
    }
}

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