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Java 如何使用JOptionPane创建菜单_Java_User Interface_Switch Statement_Joptionpane - Fatal编程技术网

Java 如何使用JOptionPane创建菜单

Java 如何使用JOptionPane创建菜单,java,user-interface,switch-statement,joptionpane,Java,User Interface,Switch Statement,Joptionpane,我创建了一个系统类,它有不同的方法来显示计算机系统的详细信息 import java.util.Properties; public class System_Y3881268 { // the attributes private String make; private String model; private int speed; private int memorySize; private double hardDiskSize;

我创建了一个系统类,它有不同的方法来显示计算机系统的详细信息

import java.util.Properties;

public class System_Y3881268 
{
    // the attributes
    private String make;
    private String model;
    private int speed;
    private int memorySize;
    private double hardDiskSize;
    private double purchaseCost;

     // the methods

     // the constructor
    public System_Y3881268(String makeIn, String modelIn, int speedIn) 
    {
        make = makeIn;
        model = modelIn;
        speed = 2;
    }

    // methods to set the corresponding attributes- mutator methods
        public void setMemory(int memorySizeIn) 
        {
            memorySize = memorySizeIn;
        }

        public void setHardDisk(double hardDiskSizeIn) 
        {
            hardDiskSize = hardDiskSizeIn;
        }

        public void setPurchaseCost(double purchaseCostIn) 
        {
            purchaseCost = purchaseCostIn;
        }

    // methods to return attribute values- accessor methods
    public String getMake() 
    {
        return make;
    }

    public String getModel() 
    {
        return model;
    }

    public int getProcessorSpeed() 
    {
        return speed;
    }

    //display details of the system
    public void displayDetails() 
    {
        System.out.println("*****Computer Details*****");
        System.out.println("Make: " + getMake());
        System.out.println("Model: " + getModel());
        System.out.println("Processor speed; " + getProcessorSpeed() + "GHz");
        System.out.println("Memory size: " + memorySize + " MB"); 
        System.out.println("Hard disk size: " + hardDiskSize + " GB");
        System.out.println("Purchase cost: £" + purchaseCost);
    }

    //check if the hard disk size is below 2GB and print corresponding message   
    public String checkHDStatus(double hardDiskSizeIn) 
    {
        if(hardDiskSizeIn<2) 
        {
            return("Low");
        }

        else 
        {
            return("Ok");
        }
    }

    //Check if the memory size is below 128MB and print corresponding message
    public boolean goodMemorySize(int memorySizeIn) 
    {
        if(memorySizeIn<128) 
        {
            return false;
        }

        else 
        {
            return true;
        }
    }

    /*use the checkHDStatus() method and the goodMemorySize() method to diagnose the 
     * system by displaying the appropriate messages*/
    public void diagnoseSystem() 
    {
        System.out.println();
        System.out.println("*****System Diagnosis*****");
        System.out.println("Hard disk size = " + checkHDStatus(hardDiskSize));
        System.out.println("Memory size Ok = " + goodMemorySize(memorySize));
    }

    //method to display system properties
    public static void displaySystemProperties() 
    {
        Properties pros = System.getProperties();
        pros.get(System.out);

        System.out.println();
        System.out.println("*****System Properties*****");

        System.out.println("Operating System Architecture: " + System.getProperty("os.arch"));
        System.out.println("Operating System Name: " + System.getProperty("os.name"));
        System.out.println("Operating System Version: " + System.getProperty("os.version"));
        System.out.println("User Account Name: " + System.getProperty("user.name"));
        System.out.println("Java Version: " + System.getProperty("java.version"));
        System.out.println();

        if(System.getProperty("os.name").equals("Windows 10")) 
        {
            System.out.println("Thumbs up! Your operating system is Windows 10");
        }
        else if(System.getProperty("os.name").equals("Linux")) 
        {
            System.out.println("Thumbs down! Your operating system is Linux");
        } 

        else 
        {
            System.out.println("Your choice of operating system is ok");
        }

    }
}

import java.util.Properties;
公共类系统_Y3881268
{
//属性
私人字符串制作;
私有字符串模型;
私人整数速度;
私有内存化;
私人双硬盘大小;
私人双重购买成本;
//方法
//构造器
公共系统_Y3881268(字符串生成、字符串建模、整数速度输入)
{
make=makeIn;
model=modelIn;
速度=2;
}
//方法来设置相应的属性-mutator方法
公共void setMemory(int memorySizeIn)
{
memorySize=memorySizeIn;
}
公共无效设置硬盘(双硬盘大小)
{
硬盘大小=硬盘大小;
}
public void setPurchaseCost(双purchaseCostIn)
{
purchaseCost=purchaseCostIn;
}
//返回属性值的方法-访问器方法
公共字符串getMake()
{
退货;
}
公共字符串getModel()
{
收益模型;
}
public int getProcessorSpeed()
{
返回速度;
}
//显示系统的详细信息
公开资料
{
System.out.println(“******计算机详细信息*****”);
System.out.println(“Make:+getMake());
System.out.println(“Model:+getModel());
System.out.println(“处理器速度;”+getProcessorSpeed()+GHz”);
System.out.println(“内存大小:+memorySize+MB”);
System.out.println(“硬盘大小:+硬盘大小+”GB”);
系统输出打印项次(“采购成本:£”+采购成本);
}
//检查硬盘大小是否低于2GB,并打印相应消息
公共字符串checkHDStatus(双硬盘大小)
{
如果(硬盘大小1)
input
是在
do
中声明的,因此,当它到达
时,
就不再存在了。2)参见3)在switch case中不需要这些花括号,如果您正确缩进代码,那么在没有花括号的情况下应该很容易理解。4)为什么要在
Runnable
对象中创建方法你说4是什么意思?我是一个完全的新手,不知道我在做什么
public void run()
private void createGUI()
都在
new Runnable(){…}
main(…)
method。这是一种错误的程序编写方式。层次结构应该是
Class>Methods
而不是
Class>Methods>Methods
。将这两种方法放在
main
之外。然后在此处编辑代码以显示所做的改进
import javax.swing.JOptionPane;

import com.sun.javafx.binding.MapExpressionHelper.SimpleChange;

public class SystemTestGUI_Y3881268 
{

    javax.swing.SwingUtilities.@invokeLater(new Runnable() {
        private StringBuffer input;

        public void run() {
            createGUI();
        }

        private void createGUI() {


            do {
                String[] choices = { "Select...", "1", "2", "3", "4", "5" };
                String input = (String) JOptionPane.showInputDialog(null, "Select a choice\n1: Print System Details\n2: Diagnose "
                        + "System\n3: Set Details\n4: Print System Properties\n5: Quit the Program", 
                        "Computer System Menu", JOptionPane.INFORMATION_MESSAGE, null, choices, choices[0]);

                System_Y3881268 s;
                switch(input) 
                {

                case "1": 

                    s.displayDetails();

                break;

                case "2": 

                    s.diagnoseSystem();

                break;

                case "3": 

                    JOptionPane.showInputDialog(null, "Enter hard disk size in GB: ");
                    double hardDiskSize = 0;
                    s.setHardDisk(hardDiskSize);
                    if(hardDiskSize<2) 
                    {
                        JOptionPane.showMessageDialog(null, "Hard disk size = Low");
                    }

                    else 
                    {
                        JOptionPane.showMessageDialog(null, "Hard disk size = Ok");
                    }

                    JOptionPane.showInputDialog(null, "Enter memory size in MB: ");
                    int memorySize = 0;
                    s.setMemory(memorySize);
                    if(memorySize<128) 
                    {
                        JOptionPane.showMessageDialog(null, "Memory Ok = False");
                    }

                    else 
                    {
                        JOptionPane.showMessageDialog(null, "Memory Ok = True");
                    }

                break;

                case "4": 

                    System_Y3881268.displaySystemProperties();

                break;

                case "5": break;
                default: JOptionPane.showMessageDialog(null, "Enter only numbers from 1 - 5");

        }
    }while (!"5".contentEquals(input)




    );}


    public static void main(String[] args) {
        System_Y3881268 s=new System_Y3881268("Lenovo", 
                "Ideacentre A340-24IWL", 2);
        s.setHardDisk(2);
        s.setMemory(128);
        s.setPurchaseCost(599);

        s.displayDetails();
        s.diagnoseSystem();
        System_Y3881268.displaySystemProperties();

    }

}));

}