猜成语游戏java java.txt

package j2se;
import java.util.Random;
import java.util.Scanner;

public class shiyan8{

public static void main(String[] args) 
{
    String[] idioms= {"努力学习","心心相印","天天向上","穷山恶水","心想事成","更上一层","一清二白","万事如意","七七八八","一心一意"};
    char[] suiji = {'学','开','心','好','天','事','一','二','请','力','想','上','向','三','白','万','如','四','七','意'};
    Random random = new Random();
    int index = random.nextInt(10);
    char[] idiom=idioms[index].toCharArray();//字符串转换为字符数组idiom
    char[] d=new char[10];
    int i=0;
    for(i=0;i<10;i++)
    {
        d[i]='0';//标号汉字数组d[]初始化
    }
    char c1,c2,c3,c4;        
    c1 = idioms[index].charAt(0);        //分别提取四个汉字放入数组idiom_1[]
    c2 = idioms[index].charAt(1);
    c3 = idioms[index].charAt(2);
    c4 = idioms[index].charAt(3);
    char[] idiom_1 = {c1,c2,c3,c4};
    for( i=0;i<4;){           
       int index_1 = random.nextInt(10);     
        if(d[index_1]=='0'){
            d[index_1] = idiom_1[i];
            i++;