Netbeans7.2为何不识别中文?

 package newpackage;
 import java.awt.*;
 import java.awt.event.*;
 import java.util.Random;
 public class NumberGame extends Frame {
     Button btn;
     TextField txt;
     Label lbl;
     Random ram=new Random();
     int number=ram.nextInt(1000);
     public NumberGame()
     {
         setLayout(null);
         btn=new Button("是");
         btn.setLocation(100,100);
         btn.setSize(80,20);
         class BtnClick implements ActionListener{
 
             @Override
             public void actionPerformed(ActionEvent e) {
                 
                 int n=Integer.parseInt(txt.getText());
                 if(n>number) {
                     lbl.setText("你输入的数字偏大");
                 }
                 else if(n<number) {
                     lbl.setText("你输入的数字偏小");
                 }
                 else if(n==number) {
                     lbl.setText("恭喜你，猜对了");
                 }
                     
             }
             
         }
         BtnClick bc=new BtnClick();
         btn.addActionListener(bc);
         add(btn);
         txt=new TextField();
         txt.setLocation(200,100);
         txt.setSize(100,20);
         add(txt);
         lbl=new Label();
         lbl.setLocation(100,130);
         lbl.setSize(100,20);
         add(lbl);