1
我正在嘗試將一個銀行帳戶轉換爲GUI,但由於setText方法,按鈕不起作用。沒有任何東西出現在textarea中。該按鈕不起作用(GUI)
Account類
public class Account {
//attribute for balance amount
private double balance;
// constructor to inital the balance attribute
public Account(double nitialBalance){
if(nitialBalance > 0.0)
balance=nitialBalance;
}
// to add money method
public void set_add_Balance(Double balance1){
balance+=balance1;
}
// the withdrawn amount from the account
public void depit(double debit){
double f=0;
balance=balance-debit;
if (balance <= 0){
f=debit;
System.out.println("f=debit");
}
if(balance <= 0){
balance = balance + f;
System.out.println("Debit amount exceeded account balance ");
}
}
// to cheack the amount you have
public double getBalance(){
return balance;
}
// tostring for get balance
public String toString(){
return "Your Balance is : "+getBalance();
}
}
該GUI方法
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GUI extends JFrame {
Account a;
JButton j1=new JButton("Your Balance");
JButton j2=new JButton("Add Money");
JButton j3=new JButton("Withdrow Money");
JButton j4=new JButton("Exit");
TextArea t1=new TextArea("");
Container cont = getContentPane();
public GUI(){
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Bank Account");
setSize(500,300);
JPanel p = new JPanel();
p.setLayout(new GridLayout(2,2));
p.add(j1); p.add(j3);
p.add(j2); p.add(j4);
cont.add(p,"South");
cont.add(t1,"Center");
j1.addActionListener(new buttons());
j2.addActionListener(new buttons());
j3.addActionListener(new buttons());
j4.addActionListener(new buttons());
}
private class buttons implements ActionListener {
public void actionPerformed (ActionEvent e){
Object c =e.getSource();
if(c==j1) {
t1.setText("Your Balance is: "+a.toString());
}
if(c==j2) {
a.set_add_Balance(50.0);
t1.setText("Your Balance is: "+a.toString());
}
if(c==j4){
System.exit(0);
}
}// end of actionPerformed
}
public static void main(String[] args) {
GUI j=new GUI();
j.setVisible(true);
}
}
在按鈕1和2
if(c==j1) {
t1.setText("Your Balance is: "+a.toString());
}
if(c==j2){
a.set_add_Balance(50.0);
t1.setText("Your Balance is: "+a.toString());
}
我試圖來解決它,會出現問題,但我不t知道程序的原因
我在帳戶類中添加了一些建議,以便更容易理解。
請帶我到解決方案。
非常感謝您提前。
你在哪裏初始化'了'? – Mac
請勿混用AWT和Swing組件。 – trashgod
謝謝MAC我找到了工作。「垃圾桶」我聽說這個問題已經在第6次更新中解決了,所以我可以混合使用沒有任何問題。如果你的意思是別的,請解釋一下,這樣我就能理解了。 – user2626051