for(:)在Java中是什么意思? [英] What does this for(:) mean in Java?

问题描述

package MyTest;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

class Person {
...
}

class Student extends Person {
...
}

public class IntrospectorDemo {

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        BeanInfo info = Introspector.getBeanInfo(Student.class, Person.class);
        PropertyDescriptor[] props = info.getPropertyDescriptors();
        for (PropertyDescriptor prop : props) {
            System.out.println(prop.getName() + "::" + prop.getPropertyType());
        }
    }

}

我正在学习上面的代码，该代码告诉我什么是自省和什么是stopClass.但是我不明白这是什么意思?用于(PropertyDescriptor prop:props)吗?通常，for()应该是这样的: for(i = 0; i< 100; i ++)有人可以帮忙进一步解释吗?谢谢！

I am learning the above code which tells me what is introspector and what is stopClass. But I don't understand what is meaning of this? for (PropertyDescriptor prop : props) ? Usually a for() should be like this: for(i=0;i<100;i++) Could anyone please help to further explain it? Thanks!

推荐答案

这是针对每个循环语法，这是Java 5中引入的.

That's the for each loop syntax, introduced in Java 5.

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