I have compiled an internal class example
http://lavasoft.blog.51cto.com/62575/179484/
/**
* 内部类创建与初始化
*
* @author leizhimin 2009-7-17 13:51:52
*/
public class Outer {
private int i = 10;
private int y = 8;
Outer() {
System.out.println("调用Outer构造方法：outer");
}
public void sayMsg() {
System.out.println("Outer class!");
}
class Inner {
int i = 1000;
Inner() {
System.out.println("调用Inner构造方法：inner");
}
void innerMsg() {
System.out.println(">>>>>Inner class!");
sayMsg();
//访问内部类自己的成员i，也可以写成 this.i++
this.i++;
//访问外部类的成员 i和y
Outer.this.i++;
y--;
}
int getI() {
return i;
}
}
public void test() {
Inner in = new Inner();
in.innerMsg();
}
public int getI() {
return i;
}
public void setI(int i) {
this.i = i;
}
}
class Test1 {
public static void main(String[] args) {
Outer outer = new Outer();
outer.test();
System.out.println(outer.getI());
System.out.println("-------1--------");
Outer.Inner iner = outer.new Inner();
iner.innerMsg();
System.out.println(iner.getI());
System.out.println("-------2--------");
System.out.println(outer.getI());
}
}
javac Test1.java prompts the following error
Test1.java: 6: class Outer is public, should be declared in a file named Outer.java
public class Outer {
^
1 error
=============
compile this example of inner classes also the case when
http://blog.csdn.net/ilibaba/article/details/3866537?reload
public interface Contents {
int value();
}
public interface Destination {
String readLabel();
}
public class Goods {
private class Content implements Contents {
private int i = 11;
public int value() {
return i;
}
}
protected class GDestination implements Destination {
private String label;
private GDestination(String whereTo) {
label = whereTo;
}
public String readLabel() {
return label;
}
}
public Destination dest(String s) {
return new GDestination(s);
}
public Contents cont() {
return new Content();
}
}
class TestGoods {
public static void main(String[] args) {
Goods p = new Goods();
Contents c = p.cont();
Destination d = p.dest("Beijing");
}
}
also suggest similar
The first example compile an error
TestGoods.java: 1: Class Contents is public, should be declared in a file named Contents.java
public interface Contents {
^
TestGoods.java: 4: Class Destination is public, should be in a file named Destination.java sound
Ming
public interface Destination {
^
TestGoods.java: 7: Goods class is public, should be declared in a file named Goods.java
public class Goods {
^
3 errors
how to solve this ? a file can have only one public class bar. Not a main example of how that one class is public
------ Solution ---------------------------- ----------------
class Outer {
private int i = 10;
private int y = 8;
Outer() {
System.out.println("调用Outer构造方法：outer");
}
public void sayMsg() {
System.out.println("Outer class!");
}
class Inner {
int i = 1000;
Inner() {
System.out.println("调用Inner构造方法：inner");
}
void innerMsg() {
System.out.println(">>>>>Inner class!");
sayMsg();
//访问内部类自己的成员i，也可以写成 this.i++
this.i++;
//访问外部类的成员 i和y
Outer.this.i++;
y--;
}
int getI() {
return i;
}
}
public void test() {
Inner in = new Inner();
in.innerMsg();
}
public int getI() {
return i;
}
public void setI(int i) {
this.i = i;
}
}
public class Test1 {
public static void main(String[] args) {
Outer outer = new Outer();
outer.test();
System.out.println(outer.getI());
System.out.println("-------1--------");
Outer.Inner iner = outer.new Inner();
iner.innerMsg();
System.out.println(iner.getI());
System.out.println("-------2--------");
System.out.println(outer.getI());
}
}
This is a basic point in a file if you have several class files , only the main method of the class can be modified with the public .
------ Solution ---------------------------------------- ----
a file can have only one public class
------ Solution ------------------------- -------------------
you now put a few classes in a java file, then it can only have one public class , gave Out, on not to test,
that you should know while the main method to run main , must be to the publc class,
Your Test is now the default permissions , which does not run up .
------ For reference only ------------------- --------------------
+1
------ For reference only --------- ------------------------------
+1
----- - For reference only ---------------------------------------
then mean just write original blog author did not pay attention to this point is not it
------ For reference only ------------------- --------------------
meaning of the original Bowen did not notice or just write a
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