Math Class

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The Java Math class has many methods that allow you to perform mathematical tasks on numbers. The Math.max(x,y) method can be used to find the highest value of x and y:

view source print? 1 System.out.println( Math.max( 10, 20 ) );      // Output: 20

The Math.min(x,y) method can be used to find the lowest value of x and y:

view source print? 1 System.out.println( Math.min( 10.2, 20.5 ) );      // Output: 10.2

The Math.sqrt(x) method returns the square root of x:

view source print? 1 System.out.println( Math.sqrt( 36.0 ) );      // Output: 6.0

Monitor.java (multi-dimensional arrays)

view source print? 01 // Elements of array are objects of a class Pixel. 02 public class Monitor { 03   public static void main( String[ ] args ) { 04     int  x = Integer.parseInt( args[0] ); 05     int  y = Integer.parseInt( args[1] ); 06     int  code[ ] = { 10, 20, 30, 40, 50, 60 }; 07     String  color[ ] = { "red", "green", "blue", "white", "black", "purple" }; 08     // Declaring an array of Pixels 09     Pixel[ ][ ]  arr; 10     // Allocating memory for 6 objects of type Pixel 11     arr = new Pixel[3][2]; 12   13     for ( int i = 0; i < 3; i++ ) 14       for ( int j = 0; j < 2; j++ ) 15         arr[i][j] = new Pixel( code[i*2+j], color[i*2+j] ); 16     System.out.println( arr[x][y].getCode( ) + " " +  arr[x][y].getColor( ) ); 17   } 18 } 19   20 class Pixel { 21   public int    code; 22   public String color; 23   24   // Constructor 25   Pixel( int code1, String color1 ) { 26     this.code  = code1; 27     this.color = color1; 28   } 29   int    getCode(  ) { return code;  } 30   String getColor( ) { return color; } 31 }

shell> java Monitor                 Output: 40 white