ArrayList in Java Collections Framework

import java.util.ArrayList;

public class TestArrayList {
    public static void main(String [] args) {
    	// create an empty array list:
    	ArrayList<String> strings = new ArrayList<String>();

    	// no elements in the array list
    	System.out.println(strings.size());
    	
    	strings.add("cat");
    	strings.add("dog");
    	strings.add("mouse");
    	
    	// you can print array lists easily
    	System.out.println(strings);
    	
    	int i = 1;
    	String s = strings.get(i);
    	System.out.println("The element at index " + i + " is \"" + s + "\"");
    	
    	// the array list hasn't changed
    	System.out.println(strings);
    	
    	strings.remove(i);
    	System.out.println(strings);
    	
    	s = strings.get(i);
    	System.out.println("The element at index " + i + " is \"" + s + "\"");
    	
    	strings.add("cat");
    	System.out.println(strings);
    	
    	// remove the first occurrence of "cat"
    	strings.remove("cat");
    	System.out.println(strings);
    	
    	strings.set(i, "cow");
    	System.out.println(strings);
    	
    	// you can use a for-each loop on array lists
        for (String str: strings){
           if (str.charAt(0)== 'c') {
    	      System.out.println(str);
           }
    	}
    }
}

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