匿名用户
1级
2010-03-19 回答
outer inner 分别指的是循环的外层 内层，可以认为是一个名字吧，要跳出的时候可以直接用比如break outer，跳出外层循环，也可以代表内部类和外部类：
package FFtest2;
public class FFOuter {
private String first;
private int second;
public FFOuter(String l, int r) {
first = l;
second = r;
}
public String addStringInteger(String first, int second) {
return first + Integer.toString(second);
}
/**
* test1
* Outter class has access to inner private field
* Outter class has access to inner method
*/
public void outterPrint() {
FFOuter.InnerDisplay temp = this.new InnerDisplay("frog", 20);
System.out.println("Outer class uses Inner class field : " + temp.innerFirst + ", " + temp.innerSecond);
temp.print(first, second);
}
private class InnerDisplay {
private String innerFirst;
private int innerSecond;
public InnerDisplay() {
this("Somebody", 0);
}
public InnerDisplay(String s, int i) {
innerFirst = s;
innerSecond = i;
}
public void print (String f, int s) {
System.out.println("Inner class: first = " + f+ ", second = " + s);
}
/**
* test 2
* Inner class has access to outer class private field
*/
public void print () {
System.out.println("Inner class uses outer class: first = " + first+ ", second = " + second);
}
/**
* test 3
* Inner class has access to outer class method.
*/
public String add(String first, int second)
{
return addStringInteger(first, second);
}
}
public static void main (String [] args){
/**
* test 4
* in main(), call outter method
* */
FFOuter outter = new FFOuter("zebra", 25);
outter.outterPrint();
/**
* test 5
* in main(), call inner method
*/
InnerDisplay innerDisplay = outter.new InnerDisplay();
innerDisplay.print();
System.out.println(innerDisplay.add("iphone", 10));
}
}
输出结果
Outer class uses Inner class field : frog, 20
Inner class: first = zebra, second = 25
Inner class uses outer class: first = zebra, second = 25
iphone10