有相应的函数没........
[此贴子已经被作者于2006-10-22 19:02:12编辑过]
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你想问什么啊，如果要获取内容就用getText()
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是清空..
一般不是用 变量.setText("");
但是我的用了没有用.....
以前的字符还在上面那......
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我写了一个计数器的程序....
框架都搞好了...就是这有问题
我这有程序 大家帮忙
改下
[CODE]import javax.swing.*;
import java.lang.*;
import java.awt.*;
import java.awt.event.*;
class Calculator extends JFrame{
private JTextField tf1;
private Container cp;
double c1,c2,r;
int c,i,j;
boolean flag=true;
String s=new String();
String str="";
String vod="";
private String btn[]=
{"0","1","2","3","4","5","6","7","8","9","+","-","*","/","=","."
};
JButton b[]=new JButton[16];
public Calculator(){
setTitle("Calculator");
setSize(300,200);
cp=getContentPane();
cp.setLayout(new BorderLayout());
JPanel jp1=new JPanel();
JPanel jp3=new JPanel();
Font ft1=new Font("Times",Font.PLAIN,20);
Font ft2=new Font("too",Font.PLAIN,14);
tf1=new JTextField(26);
jp1.add(tf1);
jp3.setLayout(new GridLayout(4,4));
for(j=0;j<btn.length;j++){
b[j]=new JButton(btn[j]);
jp3.add(b[j]);
b[j].setFont(ft1);
b[j].addActionListener(new CalButton());
}
cp.add(jp1,BorderLayout.NORTH);
cp.add(jp3,BorderLayout.CENTER);
addWindowListener(new WindowDestroyer());
}
class CalButton implements ActionListener
{
public void actionPerformed(ActionEvent e){
for (i=0 ;i<10;i++){
if (e.getSource()==b[i]){
tf1.setText("");
if (flag){
str=str+e.getActionCommand();
tf1.setText(str);
c1=i;
}
else{
str=str+e.getActionCommand();
tf1.setText(str);
c2=i;
}
}
}
if (e.getSource()==b[14]){
tf1.setText("");
r=0;
str=str+e.getActionCommand();
tf1.setText("");
switch(c){
case 0:r=c1+c2;s=Double.toString(r);tf1.setText(s);break;
case 1:r=c1-c2;s=Double.toString(r);tf1.setText(s);break;
case 2:r=c1*c2;s=Double.toString(r);tf1.setText(s);break;
case 3:r=c1/c2;s=Double.toString(r);tf1.setText(s);break;
};
c1=r;
};
for (int k=10 ;k<14;k++){
if (e.getSource()==b[k])
{ tf1.setText("");
c=k-10;
flag=false;
str=str+e.getActionCommand();
tf1.setText(str);}
}
}
}
}
class WindowDestroyer extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}
}
public class jsb{
public static void main(String args[]){
Calculator win=new Calculator();
win.setVisible(true);
}
}[/CODE]
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你的程序没有错误，但是现在你的程序并没有清空JTextField里面的东西啊！就是用*.settext("");
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6楼的 用jTextField1.setDocument(new PlainDocument());是不是也可以啊?
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我的问题解决了 不是setText("");没用
是因为我的程序里的setText(str);
字符串str
再次使用之前没有清空...
[CODE]for (int k=10 ;k<14;k++){
if (e.getSource()==b[k])
{ tf1.setText("");
c=k-10;
flag=false;
str=str+e.getActionCommand();
tf1.setText(str);
str=" ";//加上这条就好了!!1}
}[/CODE]
[此贴子已经被作者于2006-10-23 18:21:49编辑过]
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