StringBuilder和StringJoiner的运用

package test12;
import java.util.Scanner;
import java.util.StringJoiner;public class Test {
public static void main(String[] args) {/*  String str = "你玩的真好，下次别玩了，TMD，CNM";String[] arr = {"TMD", "SB", "CNM"};StringBuilder sb = new StringBuilder();for (int i = 0; i < arr.length; i++) {str=str.replace(arr[i],"***");}System.out.println(str);*//*StringBuilder sb=new StringBuilder();sb.append("aaa");sb.append("bbb");sb.append("ccc");System.out.println(sb);*//* Scanner sc=new Scanner(System.in);System.out.println("请输入字符串");String ar= sc.next();
String result=new StringBuilder().append(ar).reverse().toString();if(ar.equals(result)){System.out.println("此字符串是对称字符串");}else{ System.out.println("此字符串不是对称字符串");}*///作用 输出指定格式：[1,2,3]
/*int[] arr={1,2,3};
StringBuilder sb=new StringBuilder();
sb.append("[");for(int i=0;i<arr.length;i++){if(i==arr.length-1){sb.append(arr[i]);}else{sb.append(arr[i]).append(", ");}}sb.append("]");System.out.println(sb.toString());}*///使用StringJoiiner()/*  int[] arr={1,2,3};
StringJoiner sj=new StringJoiner(",","[","]");for (int i = 0; i < arr.length; i++) {sj.add(arr[i]+"");}System.out.println(sj.toString());*/}
}