java - 一个程序中有多种方法

Question

我正在尝试将数组 (fishWeights) 设置为使用方法找到的值。除了当我尝试编译它时:

public class GoFishEdited {
  public static void main(String[] args) {

  System.out.println("\nProject 1, Stage 3\n");

  Habitat h1 = new Habitat();
  Habitat h2 = new Habitat();

  int[] fishWeights = stockUp();     

  System.out.println("Start with some weights:");  
  for (int i : fishWeights) {
     System.out.print(i + " ");
  }

  System.out.println("\n\nMake fish of those weights.\n");

  Fish[] fishGroup = new Fish[fishWeights.length]; // array of Fish

  for (int i=0; i < fishWeights.length; i++) {
     fishGroup[i] = new Fish(fishWeights[i]);  // make fish 
  }

}
}

它指出无法找到符号 stockUp()。它在这个文件中:

public class Habitat {

ArrayList stringer = new ArrayList();
public int maxCount=25; 
public int minCount=9; 
public int maxWeight=10; 
public int minWeight=1; 
public int catchProbability=30; //0.3 

public void stockUp(int[] fishArr){

  int numofF = minCount + (int)(Math.random() * ((maxCount - minCount) + 1));

  for(int i = 0; i<numofF; i++){
     fishArr[i] = minWeight + (int)(Math.random() * ((maxWeight - minWeight) + 1));
  }
 }

public Habitat(){

}

public void addFish(Fish f) {
  stringer.add(f);
}

public void removeFish(Fish f){
  stringer.remove(f);
}

public void printFish(){
  System.out.println(stringer);
}
}

所以 stockUp 存在，我只是似乎无法让 getFishEdited 找到它。

Answer 1

在java中，一切都在对象中。因此，如果你想从类中调用方法，应该使用

Habitat habitat = new Habitat();
habitat.stockUp();