Randomize.java

package util;

import java.util.Random;
import java.util.Scanner;

/**
 * Created by belobster on 16. 11. 2.
 */
public class Randomize {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        System.out.print("항목 개수, 선택 개수 : ");
        int n = sc.nextInt();
        int s = sc.nextInt();

        String[] arr = new String[n];
        System.out.println();
        System.out.println("항목을 입력하세요.");
        for(int i=0; i<n; i++){
            arr[i] = sc.next();
        }

        System.out.println();
        System.out.print("[ ");
        Random r = new Random();
        for(int j=0; j<s; j++){
            int t = r.nextInt(n-1-j);
            System.out.print(arr[t]+", ");
            if(t!=n-1){
                String swap = arr[t];
                arr[t] = arr[n-1];
                arr[n-1] = arr[t];
            }
        }
        System.out.print("]");

    }



}