comparator.java

来自「java技术内幕源代码,配合书籍看有事半功倍的效果」· Java 代码 · 共 33 行

import java.util.*;

class comparator 
{
    public static void main(String args[]) 
    {
        TreeSet treeset = new TreeSet(new NewComparator());
        
        treeset.add("Item 0");
        treeset.add("Item 1");
        treeset.add("Item 2");
        treeset.add("Item 3");
        treeset.add("Item 4");
        treeset.add("Item 5");
        treeset.add("Item 6");

        Iterator iterator = treeset.iterator();

        while(iterator.hasNext()) {
            System.out.println(iterator.next());
        }
    }
}

class NewComparator implements Comparator 
{
    public int compare(Object obj1, Object obj2) 
    {
        if (((String) obj1).equals("Item 3")) return -1;
        return ((String) obj1).compareTo((String) obj2);
    }
}