Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

public class Main {
    public static void main(String[] argv) {
        List collection = new ArrayList();

        // For a set or list
        for (Iterator it = collection.iterator(); it.hasNext();) {
            Object element = it.next();
        }
        Map map = new HashMap();
        // For keys of a map
        for (Iterator it = map.keySet().iterator(); it.hasNext();) {
            Object key = it.next();
        }

        // For values of a map
        for (Iterator it = map.values().iterator(); it.hasNext();) {
            Object value = it.next();
        }

        // For both the keys and values of a map
        for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
            Map.Entry entry = (Map.Entry) it.next();
            Object key = entry.getKey();
            Object value = entry.getValue();
        }
    }
}