Write a Java program: public static String getHorizontalBars(int maxRows, int maxCols, int bars, char color1, char color2, char color3) - This method returns a string with a number of horizontal bars that correspond to the bars parameter. To compute the size of each horizontal bar, divide maxRows by the specified number of bars. The first horizontal bar will use color1, the second color2, and the third color3. If more than 3 bars are present, we will start again with color1. If the computed size for a horizontal bar is less than 1, or any of the colors is invalid, the method will return null and no diagram will be generated. The method MUST not rely on System.out.println(). For example, calling DrawingApp.getHorizontalBars(12, 10, 3, 'R', 'G', 'B'); will generate the string:

 RRRRRRRRRR RRRRRRRRRR RRRRRRRRRR RRRRRRRRRR GGGGGGGGGG GGGGGGGGGG GGGGGGGGGG GGGGGGGGGG BBBBBBBBBB BBBBBBBBBB BBBBBBBBBB BBBBBBBBBB