[英]error: String.format is not accepting event.getActionCommand() [as object]
[英]Java - num1 = event.getActionCommand() Doesn't work (Can't set the String as an Int)
我試圖尋找其他明顯的結果,但由於某些原因,當我添加它們時,我的一半程序停止工作。 基本上,我試圖從JTextField獲取這兩個數字並將它們添加到一起,但是,我不能將兩個字符串一起添加。 我已經嘗試將結果轉換為整數,但從String到Int的轉換顯然是不可能的。 我可能會遺漏一些明顯的東西,但我是初學者,我需要一些建議,謝謝。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class GUI extends JFrame {
private JTextField cmd = new JTextField(5);
private JButton cancel = new JButton("Cancel");
private JLabel Help = new JLabel("Enter First Number");
private int num1;
private int num2;
private int ans = num1 + num2;
public GUI() {
super("Command Line - Sum");
setLayout(new FlowLayout());
System.out.println("Successfully opened sum window.");
add(cmd);
add(Help);
add(cancel);
cmdHandler handler = new cmdHandler();
cmd.addActionListener(handler);
cancel.addActionListener(handler);
}
public static void closeWindow() {
GUI g = new GUI();
g.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
g.setSize(275, 180);
g.setVisible(true);
g.setResizable(false);
g.setLocation(0, 550);
}
private class cmdHandler implements ActionListener {
int a = 0;
public void actionPerformed(ActionEvent event) {
if (event.getSource().equals(cmd)) {
if (a == 0) {
cmd.setText("");
a++;
Help.setText("Enter Second Number");
} else if (a == 1) {
cmd.setText(num1 + " + " + num2 + " = " + ans);
a++;
Help.setText("Your final result is " + ans);
} else if (a == 2) {
closeWindow();
GUI.this.dispose();
}
} else if (event.getSource().equals(cancel)) {
closeWindow();
GUI.this.dispose();
}
}
}
}
對不起任何重復,但我找不到符合我情況的解決方案。
不要施放 ,而是解析 ..
int number = Integer.parseInt(testString);
要么
double doubleNumber = Double.parseDouble(testString);
例如,
public void actionPerformed(ActionEvent event) {
if (event.getSource().equals(cmd)) {
int number = 0;
try {
number = Integer.parseInt(cmd.getText());
} catch (NumberFormatException e) {
// TODO: figure out what to do if bad input entered
}
// ..........
筆記
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