Questions: 1. Write a java program that converts 'decimal numbers' to 'binary numbers'. ('Decimal numbers' will be read on the screen and result 'int numbers' will be written on the screen). 2. You are given a two dimension (nxn) array called 'A' as seen in Figure.1. Write a java program that finds the sum of the numbers of lower triangular part of two dimension array, 'A', in figure. (Area is bordered as red lines.) A= Figure. 1 3. Explain class, object and instance by giving an example