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LocalInnerClass.java
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78 lines (64 loc) · 1.65 KB
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package innerclasses;
/**
* RUN:
* javac innerclasses/LocalInnerClass.java && java innerclasses.LocalInnerClass
* OUTPUT:
* LocalCounter()
* Counter()
* local 0
* local 1
* local 2
* local 3
* local 4
* anonymous 5
* anonymous 6
* anonymous 7
* anonymous 8
* anonymous 9
*/
public class LocalInnerClass {
private int count = 0;
Counter getCounter(final String name)
{
// local class:
class LocalCounter implements Counter {
public LocalCounter() {
System.out.println("LocalCounter()");
}
public int next() {
System.out.print(name+" ");
return count++;
}
}
return new LocalCounter();
}
Counter getCounter2(final String name)
{
// return an object of anonymous class:
return new Counter() {
{
System.out.println("Counter()");
}
public int next() {
System.out.print(name+" ");
return count++;
}
};
}
public static void main(String[] args)
{
LocalInnerClass lic = new LocalInnerClass();
Counter
c1 = lic.getCounter("local"),
c2 = lic.getCounter2("anonymous");
for (int i = 0; i < 5; i++) {
System.out.println(c1.next());
}
for (int i = 0; i < 5; i++) {
System.out.println(c2.next());
}
}
}
interface Counter {
int next();
}