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> int x = 5
> x
5
> int y = 7
> x + y
12
> System.out.println(x+y)
12
> x + y
12
> System.out.println(x+y)
12
> "12"
"12"
> x + (int z = 4)
Invalid top level statement
> int bob = 44
> if (true) 5 else 5
Expression statement required
> 
> 
> "cat" + "dog"
"catdog"
> 4 + 5
9
> "cat" + 5
"cat5"
> 7 + "dog"
"7dog"
> 7.45 + "dog"
"7.45dog"
> 7.45 + 4
11.45
> 'c' + "dog"
"cdog"
> 7.45 + 'c'
106.45
> 8 + 'c'
107
> "8" + 'c'
"8c"
> "8" + 43
"843"
> 'a' + 'c'
196
> 
> 
> 5 - 6
-1
>  - 6
-6
> 
> 
> 
> 'c'
'c'
> "cat" + 's'
"cats"
> 
> 
> int x
> x
0
> int z
> z
0
> int sss
> sss
0
> double d2
> d2
0.0
> 
> 
> 
> int[] a1 = {1,2,3,4}
> a1
{ 1, 2, 3, 4 }
> 
> a1[3]
4
> a1[2]
3
> 
> class XYZ {int x; int y;}
> XYZ c4 = new XYZ()
> c4
XYZ@16805db8
> c4.x
0
> c4.y
0
> c4.x = 56
56
> c4.y = 100
100
> c4.x
56
> XYZ c5 = new XYZ()
> c5.x
0
> c5.y
0
> 
> class XYZ2 {int x; double y; String s;}
> XYZ2 x5 = new XYZ2()
> x5
XYZ2@7aa0d9a8
> x5.s
null
> x5.s = "cat"
"cat"
> 
> class F {public static int f(int x){return 3*x + 5;}}
> F.f(5)
20
>