import java.util.Random;

public class Test {
    
    public static void main(String[] args) {
        String s = "hello";
        char[] cs = s.toCharArray();
        charRandom(cs);
        System.out.println(String.valueOf(cs));
    }
    
    public static void charRandom(char[] c) {
        int al = c.length;
        Random ran = new Random();
        for(int i = 0; i < 100; i++) {
            int ranInt_1 = ran.nextInt(al);
            int ranInt_2 = ran.nextInt(al);
            if(ranInt_1 != ranInt_2) {
                char temp = 0;
                temp = c[ranInt_1];
                c[ranInt_1] = c[ranInt_2];
                c[ranInt_2] = temp;
            }
        }
    }
    
}