java 排列顺序，排列组合怎么做

import java.io.File;
import java.util.*;
import java.util.Random;
import java.util.Scanner;
import java.io.FileWriter;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.io.FileNotFoundException;

public class TheDa {

public static void main(String args[]) throws Exception {
System.out.println("please input the name for the list");
Scanner inputReader = new Scanner(System.in);
String TheDalist = inputReader.nextLine();
String[] newstr=TheDalist.split("\\s+");
if (newstr.length !=4) { System.out.println("the length is not ok"); }
else {
if ((newstr[0].equals("Joe")) && (newstr[1].equals("William")) &&(newstr[2].equals("Jack")) && (newstr[3].equals("Averell"))) {
System.out.println("True");
}
else if ((newstr[0].equals("Averell")) && (newstr[1].equals("Jack")) &&(newstr[2].equals("William")) && (newstr[3].equals("Joe"))) {
System.out.println("True");
}
else {
System.out.println("False");
}
}
}

}