如何创建一个窗口来运行我的字母分级程序？

Question

我是Java的初学者，所以我决定为需要编写整数形式的分数的人编写一个字母等级检查器程序。 我想知道如何为该窗口创建一个运行对话框的窗口，并为该程序的照片/徽标留出空间。

import java.util.Scanner;

public class noname {

    public static void main(String[] args) {

        Scanner user_input = new Scanner(System.in);

        int gradescore;
        System.out.println("Please enter your score and round the decimals");
        gradescore = user_input.nextInt();

        if((gradescore >= 94) && (gradescore <= 100)) {
            char grade = 'A';
            System.out.println("Your grade is an "+grade);
            gradescore = user_input.nextInt();
        } else if ((gradescore >=90) && (gradescore <= 93)) {
            char grade = 'A';
            System.out.println("Your grade is an " +grade +"-");
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 87) && (gradescore <=89)) {
            char grade = 'B';
            System.out.println("Your grade is a "+grade +"+");
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 83) && (gradescore <= 86)) {
            char grade = 'B';
            System.out.println("Your grade is a "+grade);
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 80) && (gradescore <= 82)) {
            char grade = 'B';
            System.out.println("Your grade is a "+grade +"-");
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 77) && (gradescore <= 79)) {
            char grade = 'C';
            System.out.println("Your grade is a " +grade +"-");
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 73) && (gradescore <= 76)) {
            char grade = 'C';
            System.out.println("Your grade is a " +grade);
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 70) && (gradescore <= 72)) {
            char grade = 'C';
            System.out.println("Your grade is a " +grade +"-");
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 67) && (gradescore <= 69)) {
            char grade = 'D';
            System.out.println("Your grade is a " +grade +"+");
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 63) && (gradescore <=66)) {
            char grade = 'D';
            System.out.println("Your grade is a " +grade);
            gradescore = user_input.nextInt();
        } else if ((gradescore >= 60) && (gradescore <= 62)) {
            char grade = 'D';
            System.out.println("Your grade is a " +grade +"-");
            gradescore = user_input.nextInt();
        } else if (gradescore < 60) {
            char grade = 'F';
            System.out.println("Your grade is an " +grade);
        }
    }

}

Answer 1

Java中有一个称为swing的部分，它可以处理窗口：

https://docs.oracle.com/javase/tutorial/uiswing/

如果您不喜欢它，可以尝试使用XML来存储UI的javafx：

https://docs.oracle.com/javafx/2/get_started/jfxpub-get_started.htm

Answer 2

您可以使用java swing做到这一点。

这是一个使用swing创建窗口的非常基本的示例：

import java.awt.EventQueue;
import javax.swing.JFrame;

public class SimpleExample extends JFrame {

    public SimpleExample() {

       setTitle("Simple example");
       setSize(300, 200);
       setLocationRelativeTo(null);
       setDefaultCloseOperation(EXIT_ON_CLOSE);        
    }


    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                SimpleExample ex = new SimpleExample();
                ex.setVisible(true);
            }
        });
    }
}

您可以按照以下教程进行操作：

http://zetcode.com/tutorials/javaswingtutorial/firstprograms/

希望能帮助到你。