textdemo.java

180个针对Java初学者的简单实例,包含了180個適合與初學者的源碼實例

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.ActionEvent;
public class TextDemo extends JFrame
            implements ActionListener {
  private JLabel lbName,lbAddr,lbTel;
  private JTextField tfName,tfAddr,tfTel;
  private JTextArea taCollect;
  private JPanel InputPanel,CollectPanel;
  private GridBagLayout  InputLayout;
  private GridBagConstraints constraints;
  private Container container;
  public TextDemo()  {
    super("个人信息");
    setSize(300,260);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    container=this.getContentPane();
    container.setLayout(new GridLayout(2,1));
  }
  //以设定的网格包布局向面板中添加组件
  private void AddComponent(JPanel panel,GridBagLayout Layout,
         GridBagConstraints gbc,Component com,int row,int column,int numRows,
                                 int numColumns,int Weightx,int Weighty){
    gbc.gridx=row;
    gbc.gridy=column;
    gbc.gridwidth=numRows;
    gbc.gridheight=numColumns;
    gbc.weightx=Weightx;
    gbc.weighty=Weighty;
    Layout.setConstraints(com,gbc);
    panel.add(com);
  }
  public void setLayout(){
   InputPanel=new JPanel();
   InputLayout=new GridBagLayout();
   constraints=new GridBagConstraints();
   InputPanel.setLayout(InputLayout);
   //创建姓名标签并添加到输入面板
   constraints.anchor=GridBagConstraints.CENTER;
   lbName=new JLabel("姓名");
   constraints.fill=GridBagConstraints.NONE;
   AddComponent(InputPanel,InputLayout,constraints,lbName,0,0,1,1,20,0);
   //创建姓名文本框并添加到输入面板
   tfName=new JTextField();
   constraints.fill=GridBagConstraints.HORIZONTAL;
   AddComponent(InputPanel,InputLayout,constraints,tfName,1,0,1,1,80,100);
   //创建住址标签
   lbAddr=new JLabel("住址");
   constraints.fill=GridBagConstraints.NONE;
   AddComponent(InputPanel,InputLayout,constraints,lbAddr,0,1,1,1,20,0);
   //创建住址文本框
   tfAddr=new JTextField();
   constraints.fill=GridBagConstraints.HORIZONTAL;
   AddComponent(InputPanel,InputLayout,constraints,tfAddr,1,1,1,1,80,100);
   //创建电话标签
   lbTel=new JLabel("电话");
   constraints.fill=GridBagConstraints.NONE;
   AddComponent(InputPanel,InputLayout,constraints,lbTel,0,2,1,1,20,0);
   //创建电话文本框
   tfTel=new JTextField();
   tfTel.addActionListener(this);
   constraints.fill=GridBagConstraints.HORIZONTAL;
   AddComponent(InputPanel,InputLayout,constraints,tfTel,1,2,1,1,80,100);
   //添汇总信息面板
   CollectPanel=new JPanel();
   CollectPanel.setLayout(new BorderLayout());
   taCollect=new JTextArea("汇总信息");
   taCollect.enable(false);//标止直接对汇总信息编辑
   CollectPanel.add(taCollect);
  //将输入面板和汇总信息面板添加到框架中
   container.add(InputPanel);
   container.add(CollectPanel);
  }
  public static void main(String[] args) {
    TextDemo frame = new TextDemo();
    frame.setLayout();
    frame.show();
  }
  public void actionPerformed(ActionEvent e) {
    if(e.getSource() instanceof JTextField){
      //向文本框添加信息
      taCollect.append("\n");
      taCollect.append(tfName.getText()+"\n");
      taCollect.append(tfAddr.getText()+"\n");
      taCollect.append(tfTel.getText()+"\n");
    }
  }
}