1、体系结构

2、工具类：

package collection;

public class InnerTest {
 private int age;

public final int getAge() {
	return age;
}

public final void setAge(int age) {
	this.age = age;
}

public InnerTest(int age) {
	super();
	this.age = age;
}
public int compareTo(Object obj) {
	return 1;
}
public boolean equals(Object obj) {
	return false;
}
}
package c