语法错误，大神们帮忙看看

痞子2号 2014-05-13 09:40:04





import javax.swing.JFrame;

import javax.swing.JPanel; 

import javax.swing.JTextField;

import javax.swing.JLabel;

import javax.swing.JButton;

import java.awt.BorderLayout; 

import javax.swing.Spring;  

import javax.swing.SpringLayout;  

import java.awt.Container;



public class mytest02

{

JFrame jf = new JFrame("登录");

Container contentPane = jf.getContentPane();

SpringLayout layout = new SpringLayout();

contentPane.setLayout(layout);//这步有错，怎么改？

private JLabel jl1 = new JLabel("用户名");

private JTextField jtf1 = new JTextField(20);

private JLabel jl2 = new JLabel("  密码   ");

private JTextField jtf2 = new JTextField(20);

private JButton jb = new JButton("登录");

public void init() throws Exception

{	

    jf.setSize(400,300);

    jb.setBounds(20,10,200,580);

    contentPane.add(jl1);

    contentPane.add(jtf1);

    contentPane.add(jl2);

    contentPane.add(jtf2);

  //  contentPane.add(jb);

    layout.putConstraint(SpringLayout.NORTH, jl1, 20,   

    SpringLayout.NORTH, contentPane);    

    layout.putConstraint(SpringLayout.WEST, jl1, 10,   

    SpringLayout.WEST, contentPane);   

    layout.putConstraint(SpringLayout.NORTH, jtf1, 20,   

    SpringLayout.NORTH, contentPane);  

     layout.putConstraint(SpringLayout.WEST, jtf1, 5,   

    SpringLayout.EAST, jl1);  

    

    layout.putConstraint(SpringLayout.NORTH, jl2, 60,   

    SpringLayout.NORTH, contentPane);  

    layout.putConstraint(SpringLayout.WEST, jl2, 10,   

    SpringLayout.WEST, contentPane);               

    layout.putConstraint(SpringLayout.NORTH, jtf2, 60,   

    SpringLayout.NORTH, contentPane);  

     layout.putConstraint(SpringLayout.WEST, jtf2, 5,   

    SpringLayout.EAST, jl2);  



    jf.setVisible(true);

}

public static void main(String[] arg0)throws Exception

{

	mytest02 lft = new mytest02();

lft.init();



}

}

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teemai 2014-05-13

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contentPane.setLayout(layout);//这步有错，怎么改？放到下面的方法里

痞子2号 2014-05-13

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哈哈！谢谢！

huoxu 2014-05-13

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代码要写在方法里面，方法外面只能定义。 JFrame jf = new JFrame("登录"); Container contentPane = jf.getContentPane(); SpringLayout layout = new SpringLayout(); contentPane.setLayout(layout);//这步有错，怎么改？这些代码写到构造方法里面去，new的时候就直接调用了。