Question

我非常非常熟悉Java，我有一个即将到期的项目。

除了在工作中存储和显示信息之外，我还做了其他所有事情。

我该怎么做？

首先，我有4个班级

数字1是名为＆＃34;的类。电脑＆＃34; 。它存储所有变量。

select DATEDIFF(second, EventStartTimeStamp_UTC0, EventEndTimeStamp_UTC0) as EventDuration
from allEvent
where DATEDIFF(Minute, EventStartTimeStamp_UTC0, EventEndTimeStamp_UTC0) < 1

数字2是名为＆＃34;计算机演示＆＃34; 。它将显示我写的所有文本，并且是主类。但我不知道在哪里放置for循环来显示存储的信息。

public class Computer {
private String computerID;
private String processorSpeed;
private String ram;
private String hardDisk;
public double price;

 public Computer(String computerID,String processorSpeed,String ram,String hardDisk){

    this.computerID = computerID;
    this.processorSpeed = processorSpeed;
    this.ram = ram;
    this.hardDisk = hardDisk;

     }//Constructor

public String getComputerID(){
    return computerID;
}//getComputerID

public String getProcessorSpeed(){
    return processorSpeed;
}//getProcessorSpeed

public String getRam(){
    return ram;
}//getRam

public String getHardDisk(){
    return hardDisk;
}//getHardDisk

}//class Computer

最后2只是一个子类，它在显示代码时会有额外的信息。

import java.util.Scanner;

public class ComputerDemo {

public static void main(String[] args) {

    Scanner input  = new Scanner(System.in);

    String response;
    int countDesktop = 1;// d1
    int countdeskid = 1;//desktop ID
    int countdeskpspd = 1;// array deskpspd
    int countdeskram = 1;// dekstop ram
    int countdeskdisk = 1;// desktop disk
    int countdeskmonitor = 1;// desktop monitor

    Desktop[] d1 = new Desktop[countDesktop];

    int countLaptop = 1; // l1
    int countlaptopid = 1 ; // laptop ID
    int countlaptoppspd = 1 ; // array deskspspd
    int countlaptopram = 1 ; // laptop ram
    int countlaptopdisk = 1 ; // laptop disk
    int countlaptopweight = 1 ; // laptop weight

    Laptop[] l1 = new Laptop[countLaptop] ;

    String[] deskid = new String[countdeskid];
    String[] deskpspd = new String[countdeskpspd];
    String[] deskram = new String[countdeskram];
    String[] deskdisk = new String[countdeskdisk];
    String[] deskmonitor = new String[countdeskmonitor];

    do {
        System.out.println("************************ Artificial Intelligence Co. ************************");
        System.out.println("Computer Menu:");
        System.out.println("1. Add information for new Desktop");
        System.out.println("2. Add information for new Laptop");
        System.out.println("3. Display all computer information");
        System.out.println("4. Quit");
            System.out.println("*****************************************************************************");
        System.out.print("Please enter either 1 to 4: ");
        response = input.nextLine();
        System.out.println("");
        try{
        if(Integer.parseInt(response) == (1)){

            System.out.println("=============================================================================================");
            System.out.println("Information for new Desktop");
            System.out.println("=============================================================================================");
            System.out.print("What is the computer ID : ");
            deskid[countdeskid-1] = input.nextLine();
            countdeskid++;
            System.out.print("What is the Processor Speed : ");
            deskpspd[countdeskpspd-1] = input.nextLine();
            countdeskpspd++;
            System.out.print("What is the RAM : ");
            deskram[countdeskram-1] = input.nextLine();
            countdeskram++;
            System.out.print("What is the Harddisk size : ");
            deskdisk[countdeskdisk-1] = input.nextLine();
            countdeskdisk++;
            System.out.print("What is the Monitor Type : ");
            deskmonitor[countdeskmonitor-1] = input.nextLine();
            System.out.println("What is the Price : ");
            response = input.nextLine();
            System.out.println("");
            System.out.println("Your information has  been added successfully.");
            System.out.println("");

    String[] laptopid = new String [countlaptopid] ;
    String[] laptoppspd = new String [countlaptoppspd] ;
    String[] laptopram = new String [countlaptopram] ;
    String[] laptopdisk = new String [countlaptopdisk] ;
    String[] laptopweight = new String [countlaptopweight] ;

        System.out.println("************************ Artificial Intelligence Co. ************************");
        System.out.println("Computer Menu:");
        System.out.println("1. Add information for new Desktop");
        System.out.println("2. Add information for new Laptop");
        System.out.println("3. Display all computer information");
        System.out.println("4. Quit");
        System.out.println("*****************************************************************************");
        System.out.print("Please enter either 1 to 4: ");
        response = input.nextLine();
        System.out.println("");

        if(Integer.parseInt(response) == (2)){

            System.out.println("=============================================================================================");
            System.out.println("Information for new Laptop");
            System.out.println("=============================================================================================");
            System.out.print("What is the computer ID : ");
            laptopid[countlaptopid-1] = input.nextLine();
            countlaptopid++;
            System.out.print("What is the Processor Speed : ");
            laptoppspd[countlaptoppspd-1] = input.nextLine();
            countlaptoppspd++;
            System.out.print("What is the RAM : ");
            laptopram[countlaptopram-1] = input.nextLine();
            countlaptopram++;
            System.out.print("What is the Harddisk size : ");
            laptopdisk[countlaptopdisk-1] = input.nextLine();
            countlaptopdisk++;
            System.out.print("What is the weight : ");
            laptopweight[countlaptopweight-1] = input.nextLine();

            System.out.println("What is the Price : ");
            response = input.nextLine();
            System.out.println("");
            System.out.println("Your information has  been added successfully.");
            System.out.println("");

        }//else if 2
        else if(Integer.parseInt(response) == (3)){

        }//else if 3
        else if(Integer.parseInt(response) == (4)){
            break;
        }//else if 4

        }

          }//try
        catch(Exception e){

        }//catch

    }while(true);

}

}//class ComputerDemo

和

public class Desktop extends Computer {

String monitorType;

public Desktop(String monitor, String computerID,String processorSpeed,String ram,String hardDisk){
    super(computerID,processorSpeed,ram,hardDisk);
    this.monitorType = monitorType;
}//constructor

public void displayInfo(){

   System.out.println("Computer ID : " + getComputerID());
    System.out.println("Processor Speed : " + getProcessorSpeed());
    System.out.println("RAM : " + getRam());
    System.out.println("Harddisk : " + getHardDisk());
    System.out.println("Monitor : " + monitorType);
    System.out.println("Price : " + price);

}

}

那么我如何使用for循环显示代码？我应该把for循环放在哪里？

Answer 1

在不知道数据是什么或者您正在尝试做什么的情况下，要在数组中显示信息，您需要使用循环。

for(int i = 0; i < array.length; i++) {
  System.out.println(array[i]);
}

编辑：

首先，我要更改您的信息设置，因为您的类包含了您未使用的构造函数，字段和方法。从用户获取信息后，您应该将其放入类构造函数中，然后将新对象添加到数组中。即：

Laptop[] arrLaptop = new Laptop[count];
Laptop newLaptop = new Laptop(monitor, computerID, processorSpeed, ram, hardDisk);
arrLaptop[i] = newLaptop;

然后在你的for循环中你可以运行它：

else if(Integer.parseInt(response) == (3)){
  for(int i = 0; i < arrLaptop.length; i++) {
    arrLaptop[i].displayInfo();
  }
}//else if 3

如果您想要更好地理解，我建议您查看一些基本的面向对象编程教程。

如何显示我在数组中保存的信息？

1 个答案: