forindemo.java

基于netbeans的java桌面应用程序合集

package com.sun.tiger.forin;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ForInDemo {
    
    public static void main(String[] args) {
        
        // These are collections we抣l iterate over below.
        List wordlist = new ArrayList();
        Set wordset = new HashSet();
        
        // We start with a basic loop over the elements of an array.
        // The body of the loop is executed once for each element of args[].
        // Each time through one element is assigned to the variable word.
        System.out.println("Assigning arguments to lists...");
        for(String word : args) {
            System.out.print(word + " ");
            wordlist.add(word);
            wordset.add(word);
        }
        
        System.out.println();
        
        // Iterate through the elements of the List now.
        // Since lists have an order, these words should appear as above
        System.out.println("Printing words from wordlist " +
                "(ordered, with duplicates)...");
        for(Object word : wordlist) {
            System.out.print((String)word + " ");
        }
        
        System.out.println();
        
        // Do the same for the Set. The loop looks the same but by virtue of
        // using a Set, we lose the word order and also discard duplicates.
        System.out.println("Printing words from wordset " +
                "(unordered, no duplicates)...");
        for(Object word : wordset) {
            System.out.print((String)word + " ");
        }
    }
}