package 第十九章.文字编辑器;
import java.awt.*;
import java.awt.event.*;
public class TextField {
public static void main(String[] args) {
new Text();
}
}
class Text extends Frame
{
TextField tf;
public Text(){
tf=new TextField();
add(tf);//在这有错
tf.addActionListener(new Monitor());//这儿有错
tf.setEchoChar('*');//这儿也有
pack();
setVisible(true); }
}
class Monitor implements ActionListener
{ public void actionPerformed(ActionEvent e) {
TextField tf=(TextField)e.getSource();
System.out.println(tf.getText());//这儿有
tf.setText("");//这儿也有
}
}
到底怎么回事啊我实在不明白自己哪儿说了求救
import java.awt.*;
import java.awt.event.*;
public class TextField {
public static void main(String[] args) {
new Text();
}
}
class Text extends Frame
{
TextField tf;
public Text(){
tf=new TextField();
add(tf);//在这有错
tf.addActionListener(new Monitor());//这儿有错
tf.setEchoChar('*');//这儿也有
pack();
setVisible(true); }
}
class Monitor implements ActionListener
{ public void actionPerformed(ActionEvent e) {
TextField tf=(TextField)e.getSource();
System.out.println(tf.getText());//这儿有
tf.setText("");//这儿也有
}
}
到底怎么回事啊我实在不明白自己哪儿说了求救
其他地方 也是相似的错误
System.out.println(tf.getText());// 这儿有
tf.setText("");// 这儿也有
这两个地方 如果你是用你自己定义的那个类,那这两个方法没定义,如果是要用我上边提到的那个类。那跟上边一个错误
import java.awt.event.*;public class sunknow1 extends Frame implements ActionListener {
public static void main(String[] args) {
new sunknow1();
}
Label prompt, output;
TextField input;
sunknow1(){
setBounds(300,300,400,300);
prompt = new Label("请输入一个年份:");
output = new Label(" ");
input = new TextField(6);
setLayout(new FlowLayout());
add(prompt);
add(input);
add(output);
input.addActionListener(this);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setVisible(false);
System.exit(0);
}
});
setVisible(true);
}
public void actionPerformed(ActionEvent e){
int getInt = Integer.parseInt(input.getText());
if(getInt%4==0 && getInt%100 !=0 || getInt%400 ==0) {
output.setText(" " + getInt + "为闰年!");
}
else{
output.setText(" " + getInt + "不是闰年!");
}
}
}
参考下哈/
package event;public class TextField11 {
public static void main(String[] args) {
new Text();
}
}
package event;import java.awt.Frame;
import java.awt.TextField;public class Text extends Frame {
private TextField tf; public Text() {
tf = new TextField();
add(tf);
tf.addActionListener(new Monitor());
tf.setEchoChar('*');
pack();
setVisible(true); }}
package event;import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;public class Monitor implements ActionListener { public Monitor() { } @Override
public void actionPerformed(ActionEvent e) {
TextField tf = (TextField) e.getSource();
System.out.println(tf.getText());
tf.setText("");
}}
用我上面的,能跑通。。测试了