Write a method markLength4 that takes an ArrayList of Strings as a parameter and

Question

Write a method 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 a variable 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.

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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