看java核心技术里一个例子

看java核心技术里一个例子public class welcome{public static void main(String[] args){String[] greeting=new String[3];greeting[0]="welcome to core java";greeting[1]="by Gay Horstmann";greeting[2]="and Gary Cornell";for(String g:greeting)System.out.println(g);}}代码无误,执行也正常.可是for(String g:greeting)这一句我看不懂,这是for循环么.