java - Eclipse 上的 JOptionPane 错误

Question

我对 Java 非常陌生(即 AP 计算机科学 A 的第 2 周)。我们必须使用 JOptionPane 来制作消息框以用于数学运算。我的代码在学校很好，但我必须重新格式化它，因为我将它保存在 Facebook 上(没有其他选择)。现在，我在所有 JOptionPane 行上都收到错误，提示“此行有多个标记”和“标记上的语法错误”。我该如何解决这个问题。这是代码(请仅修复我所要求的内容，没有其他内容，我知道代码可能很奇怪)

import javax.swing.JOptionPane;

public class OptioPane {

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

    String a = JOptionPane.showInputDialog("Enter an integer");
    String b = JOptionPane.showInputDialog("Input another");
    int x = Integer.parseInt(a);
    int y = Integer.parseInt(b);
    JOptionPane.showMessageDiaglog(null, "The numbers added together is " +(x+y));

    String c = JOptionPane.showInputDialog("Enter an integer");
    String d = JOptionPane.showInputDialog("Input another");
    int f = Integer.parseInt(c);
    int g = Integer.parseInt(d);
    JOptionPane.showMessageDialog(null, "The second number subtracted from the first number is " +(f-g));

    String s = JOptionPane.showInputDialog("Enter an integer");
    String r = JOptionPane.showInputDialog("Input another");
    int w = Integer.parseInt(a);
    int q = Integer.parseInt(b);
    JOptionPane.showMessageDialog(null, "The numbers multiplied together is " +(w*q));

    String k = JOptionPane.showInputDialog("Enter an integer");
    String j = JOptionPane.showInputDialog("Input another");
    int n = Integer.parseInt(a);
    int m = Integer.parseInt(b);
    JOptionPane.showMessageDialog(null, "The first number divided by the second number is " +(n/m));

    String fir = JOptionPane.showInputDialog("Enter an integer");
    String tir = JOptionPane.showInputDialog("Input another");
    int ah = Integer.parseInt(a);
    int bh = Integer.parseInt(b);
    JOptionPane.showMessageDialog(null, "The first number modulated by the second number is " +(ah*bh));
    }

Answer 1

基本上，代码主体位于任何可执行上下文之外(不是它所属的位置)....

public class OptioPane {

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

    /* All your stuff - out of bounds and behaving badly */

}

相反，您需要将此代码放置在可执行上下文中，例如 main 方法...

public class OptioPane {

    public static void main(String[] args) {    
        /* All your stuff - playing nicely */
    }


}

哦，添加这一行...

JOptionPane.showMessageDiaglog(null, "The numbers added together is " +(x+y));

错了，看Dialog中多了一个g，应该是...

JOptionPane.showMessageDialog(null, "The numbers added together is " +(x+y));