java编写的猜数游戏

import javax.swing.UIManager;

public class MainClass
{

 public MainClass()
 {
 }

 public static void main(String args[])
 {
  try
  {
   UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
  }
  catch (Exception exception) { }
  new NumGuessing();
 }
}



import java.util.ArrayList;

public class Methods
{

 public Methods()
 {
 }

 public static int[] RandomNum()
 {
  int guessNum[] = new int[4];
  ArrayList Temp = new ArrayList();
  for (int i = 0; i < 4; i++)
   guessNum[i] = -1;

  for (int i = 0; i < 4; i++)
  {
   do
   {
    float tempNum = (float)Math.random() * 10F;
    if ((double)tempNum >= 9.5D)
     guessNum[i] = 0;
    else
     guessNum[i] = Math.round(tempNum);
   } while (Temp.contains(Integer.valueOf(guessNum[i])));
   Temp.add(Integer.valueOf(guessNum[i]));
  }

  return guessNum;
 }

 public static boolean CheckIsFourNum(String enterString)
 {
  boolean IsFourNum = true;
  try
  {
   Integer.valueOf(enterString);