The implementation code to sort an object property in the Java ArrayList collection _java

In the development of sometimes need to encapsulate the page sorting, list how to sort a property, share a small example, we encourage each other, hope to be useful for everyone, please advise.

The 1.Student Bean is as follows:

public class Student {
	private int age;
	
	private String name;
	
	Private String weight;
	Public String Getweight () {return
		weight;
	}
	public void Setweight (String weight) {
		this.weight = weight;
	}
	public int getage () {return age
		;
	}
	public void Setage (int age) {
		this.age = age;
	}
	Public String GetName () {return
		name;
	}
	public void SetName (String name) {
		this.name = name;
	}
}

2. Sort by the int type attribute of the object in the list

 /**
 * Sort by the attributes of an int type in the list
 * @param list
/@SuppressWarnings ("unchecked") public
static void Sortintmethod (List list) {
  collections.sort (list, new Comparator () {
		@Override public
		int compare (Object O1, Object O2) {
			Student stu1= (Student) O1;
			Student stu2= (Student) O2;
			if (Stu1.getage () >stu2.getage ()) {return
				1;
			} else if (Stu1.getage () ==stu2.getage ()) {return
				0;
			} else{
				return-1
			}}	  	
  );
  System.out.println ("///////////////after/////////////sort");
  for (int i=0;i<list.size (); i++) {
  	Student st= (Student) list.get (i);
  	System.out.println ("st.age=" +st.getage () + ", st.name=" +st.getname ());
  }

3. Sort by string attributes of the objects in the list

1) Method One:

 /**
 * Sort by a string attribute in the list
 * @param list
/@SuppressWarnings ("unchecked") public
static void Sortstringmethod (List list) {
  collections.sort (list, new Comparator () {
		@Override public
		int Compare ( Object O1, Object O2) {
			Student stu1= (Student) O1;
			Student stu2= (Student) O2;
			Return Stu1.getname (). CompareTo (Stu2.getname ());
		}	  	
  );
  System.out.println ("///////////////after/////////////sort");
  for (int i=0;i<list.size (); i++) {
  	Student st= (Student) list.get (i);
  	System.out.println ("st.age=" +st.getage () + ", st.name=" +st.getname ());
  }

2) Method Two:
Implemented using Java.text.RuleBasedCollator to perform a locale-sensitive string comparison:

/**
	 * Sort by a string attribute in the list
	 * @param list
	/@SuppressWarnings ("unchecked") public
	static void Sortbyrulebasedcollator (List list) {
		collections.sort (list, new Comparator () {
			@Override public
			int Compare (object O1, Object O2) {return
			  (java.text.RuleBasedCollator) java.text.Collator.getInstance ( Java.util.Locale.CHINA)). Compare ((Student) O1). GetName (), ((Student) O2). GetName ());
		System.out.println ("///////////////after/////////////sort");
	  for (int i=0;i<list.size (); i++) {
	  	Student st= (Student) list.get (i);
	  	System.out.println ("st.age=" +st.getage () + ", st.name=" +st.getname ());
	  }
	

4. Test the Sorting method

    @SuppressWarnings ("unchecked") public
static void Main (string[] args) {

	ArrayList list=new ArrayList ();
	Student t1=new Student ();
	T1.setage (km);
	T1.setname ("Wanglei");
	List.add (t1);
	
	Student t2=new Student ();
	T2.setage (4);
	T2.setname ("Lisi");
	List.add (T2);
	
	Student t3=new Student ();
	T3.setage (a);
	T3.setname ("Zhonghua");
	List.add (T3);
	
	Student t4=new Student ();
	T4.setage ();
	T4.setname ("Waanglei");
	List.add (T4);
	System.out.println ("/////////////sort before///////////////");
	for (int i=0;i<list.size (); i++) {
  	Student st= (Student) list.get (i);
  	System.out.println ("st.age=" +st.getage () + ", st.name=" +st.getname ());
  }
        Sort
	Sortintmethod (list) According to the attributes of an int type in the list;
	Sort
	Sortstringmethod (list) by one of the string attributes in the list;	

5. The result