returning 2d array in java

Code Java:

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public class test {
	private String key;
	private String plain;
	String [][] plainArray = new String[4][4];
 
	public String[][] getPlainArray(String plain)
	{
 
		int begin=0,end=2;
		for(int i=0;i<=3;i++){
			for(int j=0;j<=3;j++)
			{
				plainArray[i][j]=plain.substring(begin,end);
				begin = begin+2;
				end=end+2;
			}
		}
		return plainArray;
	}
 
 
	public static void main(String arg[])
	{
		String plain="0123456789ABCDEF0123456789ABCDEF";
		String key=  "d2f60c436e7ccebb8eaceaf3f86c8bad";
		test t = new test();
 
		for(int i=0;i<=3;i++)
		{
			for(int j=0;j<=3;j++)
			{
				System.out.print(t.plainArray[i][j]);
			}
			System.out.println();
		}
 
 
	}//end of main
 
}//end of class

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