Question

问题：

我的整数调用函数运行正常。但是双功能不起作用。需要帮忙。如果我输入数据选择3它应该捕获双值并输出“您输入的数据类型是正确的其他”您输入的数据类型不正确\ n请再试一次“。
同样需要为String值做。如果我选择数据类型1，则用户需要输入字符串值。除此之外，程序必须输出“您输入的数据类型不正确\ n请再试一次”，如果跟随字符串的尝试是否正确，则输出“您输入的数据类型是正确的”

主程序

import javax.swing.*;

public class Q1DataType {

    public static int a, b, c, i;
    public static double d, e;

    public static void main(String[] args) {
        for (c = 1; c > 0; c++) {
            String a = JOptionPane
                    .showInputDialog("Data Type Validation Program\n\n\n 1). String\n 2). Integer\n 3). Double\n 4). Quit the program");
            if ((b = Integer.parseInt(a)) == 2) {
                callInteger mon = new callInteger();
            }

            if ((d = Double.parseDouble(a)) == 3) {
                callDouble mon1 = new callDouble();
            }

            if ((i = Integer.parseInt(a)) == 4) {
                System.exit(0);
            }
        }
    }
}

整数类

import javax.swing.*;

public class callInteger {

    public static int u;

    public callInteger() {
        try {
            u = Integer.parseInt(JOptionPane
                    .showInputDialog("Please input Integer Data Type"));
            JOptionPane.showMessageDialog(null,
                    "The Data Type You Entered is Correct");
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null,
                    "You Entered invalid Data Type\n Please Try Again");
        }
    }
}

双课

import javax.swing.*;

public class callDouble {

    public static double t;

    public callDouble() {
        try {
            t = Float.parseFloat(JOptionPane
                    .showInputDialog("Please Enter Double Data Type"));
            JOptionPane.showMessageDialog(null,
                    "The Data Type You Entered is Correct");
        } catch (Exception r) {
            JOptionPane.showMessageDialog(null,
                    "You Entered incorrect Data Type\n Please try again");
        }
    }
}

Answer 1

它仍然是相同的功能，但在这里。它就像你的代码一样工作：

import javax.swing.JOptionPane;

public class Q1DataType {

    public static void main(String[] args) {
        while (true) {
            String a = JOptionPane
                    .showInputDialog("Data Type Validation Program\n\n\n 1). String\n 2). Integer\n 3). Double\n 4). Quit the program");
            if (a.equals("1")) {
                // String
            }
            if (Integer.parseInt(a) == 2) {
                new callInteger();
            }
            if (Double.parseDouble(a) == 3) {
                new callDouble();
            }
            if (Integer.parseInt(a) == 4) {
                System.exit(0);
            }
        }
    }
}

编辑：啊，我想我现在明白你想做什么了。问题是，它总是将其自动加密为double值。你可以尝试类似的东西。

import javax.swing.JOptionPane;

public class callDouble {

    public static double t;

    public callDouble() {
        try {
            String s = JOptionPane.showInputDialog("Please Enter Double Data Type");
            if (s.contains(".")) {
                t = Double.parseDouble(s);
                JOptionPane.showMessageDialog(null, "The Data Type You Entered is Correct");
            } else {
                JOptionPane.showMessageDialog(null, "You Entered incorrect Data Type\n Please try again");
            }
        } catch (Exception r) {
            JOptionPane.showMessageDialog(null, "You Entered incorrect Data Type\n Please try again");
        }
    }

}

数据类型选择

1 个答案: