java - 遇到想要的输出

Question

public class dog {
  String name;
  public void bark()
  {
  System.out.println(name+ "says warf!" );
  }

public static void main(String[] args) {
    dog dog1 = new dog();
    dog1.bark();
    dog1.name="bart";
    //creation of array
    dog[] dogs= new dog[3];
    //object reference
    dogs[0]= new dog();
    dogs[1]= new dog();
    dogs[2]= dog1;
    //Accessing object variables
    dogs[0].name= "fred";
    dogs[1].name= "marge";
    System.out.println("last dog's name is");
    System.out.println(dogs[2].name);
    //looping through array
    int x=0;
     while(x < (dogs.length));
     {
        dogs[x].bark();
        x=x+1;

     }
}     

}

大家好....我是java新手，也是java编程的菜鸟......在上述代码中......按照“head First java”教科书......输出应该是

"null says warf!
last dog's name is bart
fred says warf!
marge says warf!"

但是在上面的代码中，当我在 eclipse ide 中对其进行编码时......输出的前两行我得到但不是最后两行......似乎 while 循环没有被执行...... 。任何人都可以告诉我引用输出的代码有什么问题吗？？？

Answer 1

while 末尾有一个分号声明:

while(x < (dogs.length));  // Remove the semi-colon

it seems that the while loop is not getting executed.

事实上，它会无限执行，因为x的值始终是相同的，并且由于该分号，您暂时没有任何主体来更改它。以下代码只是一个本地作用域 block ，与 while 无关.