java求和1到100之和

java求和1到100之和 package count; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; public class count{ public static void main(String[] args) { MyFrame mf=new MyFrame(); } } class MyFra extenmeds JFrame { JTextField f; JLabel L1; JButton b1; public MyFrame(){ this("count"); } public MyFrame(String title){ super(title); setSize(300,280); setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); b1=new JButton("计算"); f=new JTextField("",11); L1=new JLabel("1+2+???+100",JLabel.RIGHT); b1.addActionListener((ActionListener) new()); inclass add(L1); add(b1); add(f); FlowLayout flow=new FlowLayout(FlowLayout.CENTER,18,20); setLayout(flow); center(this); setVisible(true); } public void center(JFrame frame){ Toolkit toolkit=Toolkit.getDefaultToolkit(); Dimension dim=toolkit.getScreenSize(); int screenWidth=dim.width; int screenHeight=dim.height; int w=frame.getWidth(); int h=frame.getHeight(); int x=(screenWidth-w)/2; int y=(screenHeight-h)/2; frame.setLocation(x,y); } } } import javax.swing.*; public class qiuhe { public static void main(String[] args) { MyFrame mf=new MyFrame();} } class MyFrame extends JFrame implements ActionListener { JLabel L1; JTextField T1; JButton B1; int sum=0; public MyFrame(){ this("求和"); } public MyFrame(String title){ super(title); L1=new JLabel("1+2+3+。。。+100的和是:"); T1=new JTextField(10); B1=new JButton("计算"); add(L1); add(T1); add(B1); ionListener(this); B1.addAct setSize(250,190); FlowLayout flow=new FlowLayout(1,10,10); setLayout(flow); setBackground(Color.red); setVisible(true); } public void actionPerformed(ActionEvent e){ for(int i=1;i<=100;i++){ sum+=i; } if(e.getSource()==B1){ T1.setText(sum+""); } } }