如何在Java中使用for循环打印所有数组 [英] how to print all of arrays with for loop in java

问题描述

我在 String 中有数组。我想用来打印所有的对象。我的印象是这样做，通过循环，然后返回字符串。我不知道我需要改变来完成这个。
以下是我的努力：



  public class SolarSystem {
 private planet [] planets; 
 private int position = 0; 
 public SolarSystem（int size）{
 planets = new Planet [size]; 
} 
 public void add（Planet planet）{
 planets [position] = planet; 
 position ++; 
 
 public String toString（）{
 for（int i = 0; i  
} 
 return的toString（）; 
 
 
 $ / code $ / pre 
 $ b $ p增加行星类型
 
 
  public class Planet {
 
 
字符串名称; 
 int月亮; 
 $ b $ public Planet（String name，int moons）
 {
 this.moons =卫星; 
 this.name = name; 
 
 
 public String toString（）{
 returnThe Planet+ name +Has+ moons +Moon（s）\r\\\
; 
 
 
 $ b  
 
 
解决方案
在 Planet 类中覆盖 toString（）方法，并使用下面的代码：
  public String toString（）{
 String result =; 
 for（int i = 0; i< planets.length; i ++）{
 result + = planets [i] .toString（）; //添加逗号，如果你需要分开它，
 //最重要的是处理空值
} 
返回结果; 
} 
  
 
I have array in String. I want to use for loop to print all of the objects. I was under the impression this would be done by making for loop then returning the String. I am not sure what I need to change to accomplish this. 
Following is my effort:
    public class SolarSystem {
        private Planet[] planets;
        private int position = 0;
     public SolarSystem(int size) {
         planets = new Planet[size];
     }
    public void add(Planet planet) {
        planets[position] = planet;
        position++; 
    }
    public String toString(){
          for(int i = 0; i < planets.length; i++){

          } 
          return toString();  
    }
   }
ADDED PLANET CLASS
public class Planet  {


    String name;
    int moons;

    public Planet(String name, int moons)
    {
        this.moons = moons;
        this.name = name;               
    }

    public String toString() {
        return "The Planet " + name  + " Has " + moons + " Moon(s) \r\n ";
    }

}

解决方案
Override toString() method in Planet class, and use below code :
public String toString(){
      String result = "";
      for(int i = 0; i < planets.length; i++){
          result += planets[i].toString(); // append comma if you need to separate it,
                          // and most of all handle nulls
      } 
      return result;  
}


                        
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