java - 将数组与对象一起使用？ java

Question

我是 Java 新手，想知道下面的代码有什么问题。我正在尝试将多个对象创建为数组，如果可能的话？代码将运行并询问名称，但是在此之后就结束，我不确定为什么。任何帮助都会很棒，提前致谢。

import java.util.Scanner;


public class test {
	
    public static void main(String[] args) {
    	
    	
    	ABug[] BugObj = new ABug[3]; //Creating object BugObj of class ABug
    			
    	
    	
    	for (int i=1; i<4; i++){
    	Scanner reader = new Scanner(System.in);	
        System.out.println("Please enter the name of the bug:");
		BugObj[i].name = reader.next();
    	System.out.println("Please enter the species of the bug:");
    	BugObj[i].species = reader.next();
    		
    
    	System.out.println("Name: " + BugObj[i].name);           //Printing bug information out
    	System.out.println("Species: " + BugObj[i].species);
    	
    	}		
    }   
}

class ABug {
	int horpos, vertpos, energy, id;
	char symbol;
	String species, name;
	
}

Answer 1

您有两个问题:

• 您需要拥有要使用的对象的实例。
• 管理 for 循环的方法。

您可以将源代码修改为:

Scanner reader = new Scanner(System.in); // Take out this from inside for loop

for (int i = 0; i < BugObj.length; i++) { // Notice we use BugObj.length instead of a number and start index at 0.
  System.out.println("Please enter the name of the bug:");
  BugObj[i] = new ABug(); // You need to initialize the instance before use it
  BugObj[i].name = reader.next();