Find out the output of the following Java Programs $1.$ Class Add Two Integers public class AddTwoIntegers $\{$ public static void main$($String$[]$ args$)\{$ int first $=10$; int second $=20$; System.out.println$("$Enter two numbers: $"+$ first $+""+$ second$)$; int sum $=$ first $+$ second; System.out.println$("$The sum is: $"+$ sum$)$; $\}\}2.$ Class Multiply Two Numberspublic class MultiplyTwoNumbers$\{$ public static void main$($String$[]$ args$)\{$ float first $=1\mathrm{.}5$f; float second $=2\mathrm{.}0$f; float product $=$ first $*$ second; System.out.println$("$The product is: $"+$ product$)$; $\}\}3.$ Class for Sum of Naturalpublic classSumNatural$\{$ publicstaticvoidmain$($String$[]$ args$)\{$ int num $=10,$ sum $=0$; for$($int i $=1$; i $<=$ num; $++$i$)\{//$ sum $=$ sum $+$ i; sum $+=$ i; $\}$ System.out.println$("$Sum $="+$ sum$)$; $\}\}$