Write a complete program called markLength4 that takes an ArrayList of Strings a

Question

Write a complete program called markLength4 that takes an ArrayList of Strings as a parameter and that places a String of four asterisks ("****") in front of every String of length 4. For example, suppose that an ArrayList called "list" contains the following values:
(this, is, lots, of, fun, for, every, Java, programmer)
And you make the following call:
markLength4(list);
Then list should store the following values after the call:
(****, this, is, ****, lots, of, fun, for, every, ****, Java, programmer)
Notice that you leave the original Strings in the list (this, lots, Java) but include the four-asterisk String in front of each to mark it. You may assume that the ArrayList contains only String values, but it might be empty.

Explanation / Answer

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Program MarkLength4.java

========================================================

import java.util.ArrayList;
class MarkLength4
{
    public static void main(String args[])
    {
        ArrayList s1=new ArrayList();
        s1.add("this");s1.add("is");s1.add("lots");
        s1.add("of");s1.add("fun");s1.add("for");
        s1.add("every");s1.add("java");
        s1.add("programmer");

        int i;
        System.out.println("Before Marking Length 4:");
        System.out.print("s1=[");
        for(i=0;i<s1.size();i++)
        {
            System.out.print(s1.get(i)+" ");
        }
        System.out.print("] ");

        markLength4(s1);

        System.out.println("After Marking Length 4:");
        System.out.print("s1=[");
        for(i=0;i<s1.size();i++)
        {
            System.out.print(s1.get(i)+" ");
        }
        System.out.print("] ");
    }
    public static void markLength4(ArrayList s1)
    {
        ArrayList t1=new ArrayList();
        int size=s1.size();
        int i;
        for(i=0;i<size;i++)
        {
            String t=s1.get(i).toString();
            if(t.length()==4)t1.add("****");
            t1.add(s1.get(i));
        }
        s1.clear();
        s1.addAll(t1);
    }
}

==========================================================

Sample output:

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