?? textareaframe.java
字號:
package component;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
public class TextAreaFrame extends JFrame {
JPanel contentPane = new JPanel();
JTextArea jTextArea1 = new JTextArea
("文本框的創建語法:(1)new JTextArea(),創建空的文本框;" +
"(2)new JTextArea(String text),創建帶有文字的文本框。");
//創建文檔類
Document document;
//創建4個按鈕
JButton jButton1 = new JButton();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
JButton jButton4 = new JButton();
public TextAreaFrame() {
try {
//窗口關閉時清空內存
setDefaultCloseOperation(EXIT_ON_CLOSE);
jbInit();
}
catch (Exception e) {}
}
public static void main(String[] args) {
TextAreaFrame frame = new TextAreaFrame();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
//居中對齊
frame.setLocation((screenSize.width - frameSize.width) / 2,
(screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
}
private void jbInit() throws Exception {
contentPane = (JPanel)this.getContentPane();
setTitle("文本框示例");
setSize(new Dimension(412, 330));
contentPane.setLayout(null);
//設置文本框的位置與大小
jTextArea1.setBounds(new Rectangle(21, 30, 363, 159));
//使文本框自動換行
jTextArea1.setLineWrap(true);
jTextArea1.setWrapStyleWord(true);
//取得文本框的Document類
document = jTextArea1.getDocument();
//分別設置按鈕的標題、位置、大小與加入動作接收器
jButton1.setText("定義文本框鼠標位置");
jButton1.setBounds(new Rectangle(22, 213, 159, 30));
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton1_actionPerformed(e);
}
});
jButton2.setText("字符總數與指定范圍字符串");
jButton2.setBounds(new Rectangle(186, 213, 198, 30));
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton2_actionPerformed(e);
}
});
jButton3.setText("增加文本框的內容");
jButton3.setBounds(new Rectangle(22, 255, 158, 30));
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton3_actionPerformed(e);
}
});
jButton4.setText("在指定的位置插入字符");
jButton4.setBounds(new Rectangle(186, 255, 198, 30));
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton4_actionPerformed(e);
}
});
//加入各個控件
contentPane.add(jTextArea1, null);
contentPane.add(jButton1, null);
contentPane.add(jButton2, null);
contentPane.add(jButton3, null);
contentPane.add(jButton4, null);
}
//定義文本框鼠標位置的方法
void jButton1_actionPerformed(ActionEvent e) {
try {
int pos = Integer.parseInt(
JOptionPane.showInputDialog("請輸入文本框鼠標的位置"));
//定義文本框的光標位置
jTextArea1.setCaretPosition(pos);
}
catch (Exception e1) {}
//使文本框獲得焦點
jTextArea1.requestFocus();
}
//顯示文本框的文字總數與指定位置的字符串的方法
void jButton2_actionPerformed(ActionEvent e) {
try {
JOptionPane.showMessageDialog(null, "文本框的字符總數是" +
String.valueOf(document.getLength()) + "\n"
+ "第1至9個字符是" + document.getText(0, 8) +
"\n");
}
catch (Exception e1) {}
}
//在文本框中增加字符
void jButton3_actionPerformed(ActionEvent e) {
jTextArea1.append("\n這是新增加的內容");
}
//在文本框中插入字符
void jButton4_actionPerformed(ActionEvent e) {
jTextArea1.insert("這是新插入的內容",
jTextArea1.getCaretPosition());
}
}
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