Java中的语法是什么意思：new Stream< Integer>（）{...}？ [英] What does the syntax mean in Java: new Stream<Integer>(){ ... }?

问题描述

我遇到了下列无法识别的Java语法。

这部分很好：

  public abstract class Stream< T>实现迭代器< T> {
 public boolean hasNext（）{
 return true; } 
 public void remove（）{
 throw new RuntimeException（Unsupported Operation）; } 
} 
  

但是我没有得到：

  Stream< Integer> ones = new Stream< Integer>（）{
 public Integer next（）{
 return 1; } 
}; 
 
 while（true）{
 System.out.print（ones.next（）+，）;它是什么？
 
 
 
 
 
 $ b 
这是提供 Stream 类的内联（匿名）子类$ b 
在功能上，它是相同的：
  public NewClass extends Stream {
 public Integer next ）{
 return 1; 
} 
} 
  
和
  void someMethodInAnotherClass {
 Stream stream = new NewClass（）; 
} 
  
，但由于此类定义不在方法体外使用，将其定义为匿名。
 
I have encountered the following Java syntax that I don't recognize.

This part is fine:
public abstract class Stream<T> implements Iterator<T> {  
   public boolean hasNext() {  
      return true; }  
   public void remove() {  
      throw new RuntimeException("Unsupported Operation"); }  
}  
But this I don't get:
Stream<Integer> ones = new Stream<Integer>() {  
   public Integer next() {  
      return 1; }  
};   

while(true){  
  System.out.print(ones.next() + ", ");  
}  
What it is?
解决方案
This is providing an inline (anonymous) subclass of the Stream class.

Functionally, it is the same as:
public NewClass extends Stream {
    public Integer next() {  
       return 1; 
    }  
}
and
void someMethodInAnotherClass {
    Stream stream = new NewClass();
}
but as this class definition isn't used outside the method body, you can define it as anonymous.

                        
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