使用空布局控件无法显示

brooklyng60 2009-12-08 05:14:33

在SWING中使用空布局后，在界面中怎么一个控件都没显示啊。
跟每个控件都设置了坐标的setBounds(10,10,101,10);类似这样
然后加到panel中，也设置了panel的坐标
而且panel也设置了visible,size,
panel.setVisible(true);
panel.setSize(500,300);这样的，怎么还是不显示啊，各位大侠帮下小弟，才学JAVA没多久，谢谢了

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brooklyng60 2009-12-13

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panel.setBorder(BorderFactory.createEmptyBorder(20,20, 20, 20));

        panel.setLayout(null);

        panel.setVisible(true);//窗口可见       

        panel.setSize(500, 400);

        txtIPaddress=new JTextField("localhost");

        txtPort=new JTextField("3306");

        txtdbName=new JTextField("databasename");

        txtuserName=new JTextField();

        txtpassword=new JTextField();

        panel.add(lblIPaddress);

        lblIPaddress.setBounds(50, 10, 50, 30);

        panel.add(txtIPaddress);

        txtIPaddress.setBounds(150, 10, 150, 30);

        panel.add(lblPort); 

        lblPort.setBounds(50, 50, 50, 30);

        panel.add(txtPort);

        txtPort.setBounds(150, 50, 150, 30);

        panel.add(lbldbName); 

        lbldbName.setBounds(50, 90, 60, 30);

        panel.add(txtdbName);

        txtdbName.setBounds(150, 90, 150, 30);

        panel.add(lbluserName); 

        lbluserName.setBounds(50, 130, 60, 30);

        panel.add(txtuserName);

        txtuserName.setBounds(150, 130, 150, 30);

        panel.add(lblPassword); 

        lblPassword.setBounds(50, 170, 60, 30);

        panel.add(txtpassword); 

        txtpassword.setBounds(150, 170, 150, 30);

        btnConfirm.setEnabled(false);//初始化时确定不可用，连接测试成功后方可以确定       

        panel.add(btntext);

        panel.add(btnConfirm);

        btntext.setBounds(320, 170, 60, 30);

        btnConfirm.setBounds(400, 170, 60, 30);

        

        panel.add(rdo_mysql);

        panel.add(rdo_sqlserver);

        panel.add(rdo_oracle);

        rdo_mysql.setBounds(50, 250, 80, 30);

        rdo_sqlserver.setBounds(150, 250, 80, 30);

        rdo_oracle.setBounds(280, 250, 80, 30);

        buttongroup=new ButtonGroup();

        buttongroup.add(this.rdo_mysql);

        buttongroup.add(this.rdo_sqlserver);

        buttongroup.add(this.rdo_oracle);

365810247 2009-12-11

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panel.setVisible(true); 这句可以不用加的.不显示.把代码贴出来看一下.或者有没有抛异常....

realreachard 2009-12-11

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代码.

huntor 2009-12-11

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看一示例，仅是展示null布局

import java.awt.event.*;

import javax.swing.*;

public class NoLayoutExample extends JFrame {



    public NoLayoutExample(String name) {

        super(name);



        JTextField newItemField;

        JList itemsList;

        JButton addButton;

        JButton removeButton;



        getContentPane().setLayout(null);



        //The text field

        newItemField = new JTextField();

        newItemField.setLocation(12,12);

        newItemField.setSize(150,30);

        getContentPane().add(newItemField);



        //The Add button

        addButton = new JButton("Add");

        addButton.setMnemonic('A');

        addButton.setLocation(174, 12);

        addButton.setSize(100,30);

        getContentPane().add(addButton);



        //The List

        itemsList = new JList();

        JScrollPane scrollPane = new JScrollPane(itemsList,

        ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,

        ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);

        scrollPane.setLocation(12,45);

        scrollPane.setSize(150,150);

        getContentPane().add(scrollPane);



        //The Remove button

        removeButton = new JButton("Remove");

        removeButton.setMnemonic('R');

        removeButton.setLocation(174,45);

        removeButton.setSize(100,30);

        getContentPane().add(removeButton);

    }



    public static void main(String[] args) {

        JFrame frame = new NoLayoutExample("NULL Example");

        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);

        frame.setSize(286, 230);

        frame.setResizable(false);

        frame.setVisible(true);

    }

}