Question

求解关于java两道文本框的题目，请大侠解答！

在查找框内输入要查找内容，当文本区变化时，在出现位置框显示查找内容最后一次出现的位置

单击“乾坤大挪移”按钮实现把文本框A的内容移到文本框B中。

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Answer 1

你不会写侦器吧，去找一下相关的内容。
你的两个问题，第一个不是很明白，用我的理解了一个，如果有问题，再联系。
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import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.event.CaretEvent;
import javax.swing.event.CaretListener;

public class Ex7_5 extends JFrame implements CaretListener {
private JTextField textField;
private JTextField textField_1;
private JTextArea textArea;

public Ex7_5() {
getContentPane().setLayout(null);

textField = new JTextField();
textField.setBounds(154, 20, 96, 19);
getContentPane().add(textField);
textField.setColumns(10);

JLabel lblNewLabel = new JLabel("Find");
lblNewLabel.setBounds(42, 23, 50, 13);
getContentPane().add(lblNewLabel);

JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(46, 60, 327, 87);
getContentPane().add(scrollPane);

textArea = new JTextArea();
textArea.addCaretListener(this);
scrollPane.setViewportView(textArea);

JLabel lblNewLabel_1 = new JLabel("index");
lblNewLabel_1.setBounds(42, 166, 50, 13);
getContentPane().add(lblNewLabel_1);

textField_1 = new JTextField();
textField_1.setBounds(154, 163, 96, 19);
getContentPane().add(textField_1);
textField_1.setColumns(10);

setSize(400, 240);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}

public static void main(String[] args) {
new Ex7_5();
}

public void caretUpdate(CaretEvent arg0) {
String value = textField.getText();
if (!"".equals(value)) {
int index = textArea.getText().lastIndexOf(value);
textField_1.setText(index + "");
}
}
}

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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JButton;

public class Ex7_4 extends JFrame implements ActionListener {
private JTextField textFieldA;
private JTextField textFieldB;

public Ex7_4() {
getContentPane().setLayout(null);

textFieldA = new JTextField();
textFieldA.setBounds(125, 23, 96, 19);
getContentPane().add(textFieldA);
textFieldA.setColumns(10);

JLabel lblNewLabel = new JLabel("A");
lblNewLabel.setBounds(30, 26, 50, 13);
getContentPane().add(lblNewLabel);

JLabel label = new JLabel("B");
label.setBounds(30, 55, 50, 13);
getContentPane().add(label);

textFieldB = new JTextField();
textFieldB.setColumns(10);
textFieldB.setBounds(125, 52, 96, 19);
getContentPane().add(textFieldB);

JButton btnNewButton = new JButton("New button");
btnNewButton.addActionListener(this);
btnNewButton.setBounds(30, 95, 93, 23);
getContentPane().add(btnNewButton);
setSize(300, 180);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}

public static void main(String[] args) {
new Ex7_4();
}

public void actionPerformed(ActionEvent arg0) {
textFieldB.setText(textFieldA.getText());

}
}

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Answer 2

String a = "文本框A";
String b = "文本框b";String temp ; temp = b;b = a;a = temp; System.out.println(a+"-----"+b);

Answer 3

文本框B.text=文本框A.text

Answer 4

如果是互换内容的话 可以使用一个空瓶子C 把A的内容赋值给C B的给A C的给B

Answer 5

用的是JTextField吧？

第二题，假设按钮变量名为button。

button.addActionListener( new ActionListener( )
{
public void actionPerformed( ActionEvent e )
{
textA.setText(textB.getText());
textB.setText("");

}
} );