字符串拼接

package review100;

import java.util.Scanner;

public class 字符串拼接 {

    public static void main(String[] args) {

        int[] arr = {1,2,3,4,5,6,7}; 

        String sout = method(arr);

        System.out.println(sout);


    }

    public static String method(int[] arr){

        StringBuilder sb = new StringBuilder();

        sb.append("[");

        for(int i=0;i 
 
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运行结果：