stringBuilderDemo

package com.test.part04;

import java.util.*;

public class stringBuilderDemo {
    public static void main(String[] args) {
        StringBuilder hi=new StringBuilder("Hi");
        hi.append("!");//插入字符
        hi.append("I am ChaCha!");
        System.out.println(hi);
        System.out.println(hi.length());
        hi.delete(4,7);
        System.out.println(hi);

        Scanner scan = new Scanner(System.in);
        System.out.println("请输入需要插入的字符！");
        String in=scan.nextLine();//必须进行类型转换
        scan.close();

        //插入到stringBuilder中
        hi.insert(4,in);
        System.out.println(hi);

        //将可变字符构建器转换为字符串
        String hi01= hi.toString();
        String hi02=hi.substring(5,8);//截取需要的部分转换
        System.out.println(hi01+hi02);


    }
}