java - 形式为: "for (A b : c)" in Java的for循环

Question

这是我第一次看到这种语法:

// class Node
public class Node { 

...
...

}

public class Otherclass { ... }

Otherclass graph = new Otherclass();

// getSuccessors is a method of Otherclass class 

Node currentNode ;

List<Node> successors = graph.getSuccessors(currentNode);

// weird for loop 

for (Node son : successors) { 

// do something 

}

for 循环是什么？某种 Matlab 语法？

还有其他方法可以写这个 for 循环吗？

问候

Answer 1

那是一个 for-each 循环(也称为 enhanced-for。)

for (type var : arr) { //could be used to iterate over array/Collections class
    body-of-loop
}

The basic for loop was extended in Java 5 to make iteration over arrays and other collections more convenient. This newer for statement is called the enhanced for or for-each

(Documentation)