outer3.java

JAVA编程思想第四版英文原版习题答案. pdf原版的

// innerclasses/Outer3.java
// TIJ4 Chapter Innerclasses, Exercise 3, page 350
/* Modify Exercise 1 so that Outer has a private String field (initialized
* by the constructor), and Inner has a toString() that displays this field.
* Create an object of type Inner and display it.
*/

public class Outer3 {
	private String s;
	class Inner3 { 
		Inner3() { System.out.println("Inner()"); }
		public String toString() { return s; }
	}
	Outer3(String s) { 
		System.out.println("Outer1()");
		this.s = s;
	}
	Inner3 makeInner3() {
		return new Inner3();
	}
	public static void main(String[] args) {
		Outer3 o = new Outer3("Hi is risen!");
		Inner3 i = o.makeInner3();
		System.out.println(i.toString());
	}
}