String formatting in java

Recently I have discovered very useful static method of java.util.String class - format( String formatStr, Object arg1, ...). Here are some examples demonstrating its capabilities that I know of:

 System.out.println("\""+String.format("%10s", "mama")+"\""); 

result:"      mama"

 System.out.println("\""+String.format("%-10s", "mama")+"\"");

result:"mama      "

 System.out.println("\""+String.format("%2.7f", Math.PI)+"\"");

result:"3.1415927"