Find the different elements in the list and delete the same objects in the two list

Package com.test;

Import java.util.ArrayList;
Import Java.util.Arrays;
Import java.util.Collections;
Import java.util.List;

/**
 * 
 Find out the different elements of the two list
 * @author Leiwei 2011-12-14 * */Public
class Noequalselement {

	public static void Main (string[] args) {
		list<string> list1 = new arraylist<string> ();
		list<string> list2 = new arraylist<string> ();
		

		List1.add ("1");
		List1.add ("3");
		List1.add ("8");
		List1.add ("9");

		List2.add ("2");
		List2.add ("3");
		List2.add ("7");

		for (String s2:list1) {
			Boolean flag = false;
			for (String s1:list2) {
				if (s2.equals (S1)) {
					flag = true;
					break;
				}
			}
			if (!flag) {
				System.out.println (s2);
			}
		}
	}
}

Package com.test;
Import java.util.ArrayList;
Import Java.util.HashSet;
Import Java.util.Iterator;
Import java.util.List;

Import Java.util.Set;

Import com.model.Student; /** * Overriding object student equals method * As long as the age equality object is equal * * Delete the same object in two collections only one * @author leiwei 2011-12-19 * */public class Li
		
		stobj {public static void main (string[] args) {set<student> setstudent = new hashset<student> ();
		List<student> List1 = new arraylist<student> ();
		
		list<student> list2 = new arraylist<student> ();
		Student S1 = new Student ();
		S1.setage ("10");
		List1.add (S1);
		Student s2 = new Student ();
		S2.setage ("20");
		
		List1.add (S2);
		Student s3 = new Student ();
		S3.setage ("20");
		List2.add (S3);
		Student S4 = new Student ();
		S4.setage ("30");
		
		List2.add (S4); /** * We know the set set, the elements in the will not repeat * * will be a set of objects into the collection, will naturally emit duplicate * * Object (if student object overrides the Equals method)/Setstudent.adda
		ll (List1);
		
		Setstudent.addall (LIST2); Output test to see if successful SystEm.out.println (Setstudent.size ());
		Iterator<student> iterator = Setstudent.iterator ();
			while (Iterator.hasnext ()) {Student s = iterator.next ();
		System.out.println (S.getage ());
 }
		
	}
}

Package Com.model;

public class Student {

	private String age;

	Public String Getage () {return age
		;
	}

	public void Setage (String age) {
		this.age = age;
	}

	Overriding the Equals method as long as the age is equal, we consider the object two equal
	@Override public
	boolean equals (Object obj) {
		if (obj instanceof Student) {
			Student st= (Student) obj;
			Return (Age.equals (st.age));
		else{return
			super.equals (obj);
		}

	@Override public
	int hashcode () {return

		age.hashcode ();
	}


}