使用Java,我有一个系统类,它有不同的方法来显示计算机系统的细节。然后,我有一个测试系统类,它使用 switch 语句将这些方法作为菜单调用。如果用户输入选项 1 或 2,则会显示我已硬编码的一些输入。但是,如果他们选择三个选项,那么他们就会被提升为输入自己的输入。
如果他们在选择 3 中输入,然后再次输入选择 1 和 2,我如何让选择 1 和 2 显示他们的输入而不是我的输入?
我是一个完全的新手,我不确定我会怎么做,我已经在网上和书本上进行了研究,并在某个地方考虑了一个 if else 陈述,但我可能是错的。任何建议将不胜感激。
这是我的代码:
import java.util.Scanner;
public class SystemTest_Y3881268 {
public static void main(String[] args) {
//Create System_Y3881268 object and test methods
System_Y3881268 s=new System_Y3881268("Lenovo",
"Ideacentre A340-24IWL", 2);
s.setHardDisk(2);
s.setMemory(128);
s.setPurchaseCost(599);
//Create textual menu
int memorySize;
double hardDiskSize;
@SuppressWarnings("resource")
Scanner keyboard = new Scanner(System.in);
char choice;
do
{
System.out.println();
System.out.println("***** Computer system menu *****");
System.out.println();
System.out.println("Choice 1: Print System Details");
System.out.println("Choice 2: Diagnose System");
System.out.println("Choice 3: Set Details");
System.out.println("Choice 4: Print System Properties");
System.out.println("Choice 5: Quit the Program");
System.out.println();
System.out.println("Enter a number from 1 - 5");
System.out.println();
choice = keyboard.next().charAt(0);
switch(choice)
{
case '1':
{
s.displayDetails();
}
break;
case '2':
{
s.diagnoseSystem();
}
break;
case '3':
{
System.out.println("Enter hard disk size in GB: ");
hardDiskSize = keyboard.nextDouble();
if(hardDiskSize<2)
{
System.out.println("Hard disk size = Low");
}
else
{
System.out.println("Hard disk size = Ok");
}
System.out.println();
System.out.println("Enter memory size in MB: ");
memorySize = keyboard.nextInt();
if(memorySize<128)
{
System.out.println("Memory Ok = False");
}
else
{
System.out.println("Memory Ok = True");
}
}
break;
case '4' :
{
System_Y3881268.displaySystemProperties();
}
break;
case '5' : break;
default : System.out.println("Enter only numbers from 1 - 5");
System.out.println();
}
} while(choice != '5');
}
}
选择 1 或 2 时,您将打印 s.displayDetails(( 和 s.diagnoseSystem。
在这种情况下是您的"系统"。
现在,在查看案例 3 时,您不会直接更改"系统"中的任何内容,而只需更改两个变量的值。
但是,为了显示新尺寸,这些更改需要发生在您的实际"系统"上
所以像这样的事情可以解决问题:
case '3':
{
System.out.println("Enter hard disk size in GB: ");
hardDiskSize = keyboard.nextDouble();
s.setHardDisk(hardDiskSize); //setting the harddisk size in the "System"
if(hardDiskSize<2)
{
System.out.println("Hard disk size = Low");
}
else
{
System.out.println("Hard disk size = Ok");
}
System.out.println();
System.out.println("Enter memory size in MB: ");
memorySize = keyboard.nextInt();
s.setMemory(memorySize); //setting the new memory size within the "system"
if(memorySize<128)
{
System.out.println("Memory Ok = False");
}
else
{
System.out.println("Memory Ok = True");
}
}
或者,如果您只想在满足条件时更改大小:
case '3':
{
System.out.println("Enter hard disk size in GB: ");
hardDiskSize = keyboard.nextDouble();
if(hardDiskSize<2)
{
System.out.println("Hard disk size = Low");
}
else
{
System.out.println("Hard disk size = Ok");
s.setHardDisk(hardDiskSize); //setting the harddisk size in the "System" if it is ok
}
System.out.println();
System.out.println("Enter memory size in MB: ");
memorySize = keyboard.nextInt();
if(memorySize<128)
{
System.out.println("Memory Ok = False");
}
else
{
s.setMemory(memorySize); //setting the new memory size within the "system" if it is ok
System.out.println("Memory Ok = True");
}
}