Java Foreach语法

Motivation: Java SE5引入了一种新的更加简洁的for语法用于数组和容器。

Definition：表示不必创建int变量去对由访问项构成的序列进行计数，foreach将自动产生第一项。

 

Sample：

//: control/ForEachFloat.javapackage control; /* Added by Eclipse.py */import java.util.*;public class ForEachFloat { public static void main(String[] args) { Random rand = new Random(47); float f[] = new float[10]; for(int i = 0; i < 10; i++) f[i] = rand.nextFloat(); for(float x : f) System.out.println(x); }} /* Output:0.727115750.399826350.53094540.05341220.160206560.577997570.188478650.41701370.516602040.73734957*///:~ //: control/ForEachInt.javapackage control; /* Added by Eclipse.py */import static net.mindview.util.Range.*;import static net.mindview.util.Print.*;public class ForEachInt { public static void main(String[] args) { for(int i : range(10)) // 0..9 printnb(i + " "); print(); for(int i : range(5, 10)) // 5..9 printnb(i + " "); print(); for(int i : range(5, 20, 3)) // 5..20 step 3 printnb(i + " "); print(); }} /* Output:0 1 2 3 4 5 6 7 8 95 6 7 8 95 8 11 14 17*///:~ //: control/ForEachString.javapackage control; /* Added by Eclipse.py */public class ForEachString { public static void main(String[] args) { for(char c : "An African Swallow".toCharArray() ) System.out.print(c + " "); }} /* Output:A n A f r i c a n S w a l l o w*///:~