Difference Between Java, C# and Python Keywords

Java	C#	Python
Comments
Single line: //	//	#
Multiple lines: /*       */	/*       */	" " "        " " " (or) ' ' '    ' ' '
Data Types
int	int	Python supports all the data types but we did not specify the type of the variable. The Python interpreter will automatically interpret the variable type. Eg: a = 10 b = "Testing" c = True
float	float
double	double
char	char
var	var
boolean	bool
String	string
etc.,
Input and Output
System.out.print("string");	Console.Write("string");	print("string")
System.out.println("string");	Console.WriteLine("string");
Scanner obj = new Scanner(System.in); String name = obj.nextLine();	string name = Console.ReadLine();	name = input() or name = input("Enter your name")
nextInt(), nextFloat(), nextDouble(), nextBoolean(), nextLine(), -------	---------	int(input()), float(input()), complex(input())
Operators
Arithmetic : +, -, *, /, %, ++, --, +=, -=, *=, /=, %=		++, -- are not work
Bitwise : ~, &, |, ^, >>, >>>, <<, &=, |=, ^=, >>=, >>>=, <<=
Relatinal : ==, !=, >, <, >=, <=
Boolean Logical : &, |, ^, ||, &&, !, &=, |=, ^=, ==, !=, ?:
Java	C#	Python
Control Statements
Decision-Making statements
if(condition) {     Statements;     }	if(condition) {     Statements;     }	if condition :     Statement1     Statemnet2
if(condition1) {     Statements;     } else if(condition2) {     Statements;     } else {     Statements;     }	if(condition1) {     Statements;     } else if(condition2) {     Statements;     } else {     Statement;     }	if condition1 :     Statements elif condition2 :     Statements else :     Statements
switch(expression){ case value1:     Statement 1;     break; ------ default:     Statement; }	switch(expression){ case value1:     Statement 1;     break; ------ default:     Statement; }	Python does not support switch case statements.
Loop statements
for(initialization; condition; increment/decrement) {     Statement; }	for(initialization; condition; increment/decrement) {     Statement; }	for variable in sequence :     Statements
for(data type variable : array_name/collection_name)	foreach(data type variable in array_name/collection_name)
while(condition){     Statements;}	while(condition){     Statements;}	while condition :     Statements
do {     Statement; }while(condition)	do {     Statement; }while(condition)	Python does not support do-while statements.
Jump statements
break;	break;	break
continue;	continue;	continue
---	---	pass

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Java	C#	Python
Array
Array declaration		Python does not support Arrays. but Python Lists can be used instead of Arrays.
int[] a; int a[]; int []a;	int[] a;
int[][] a; int [][]a; int[] a[]; int[] []a; int []a[];	int[][] a;
Array Construction
int[] a = new int[5];	int[] a = new int[5];
int[][] a = new int[3][2];	int[][] a = new int[3][2];
int[] a = {1, 2, 3, 4, 5, ---}	int[] a = {1, 2, 3, 4, 5, ---}
Java	C#	Python
String Method
charAt(index)	[index]	[index]
String length: length() Array length: length	Length	-
str1.equals(str2)	String.Equals(str1, str2)	-
indexOf(String)	IndexOf(string)	-
replace('x', 'y')	Replace('x', 'y')	-
split()	Split()	-
toUpperCase()	ToUpper()	-
toLowerCase()	ToLower()	-
compareTo()	Compare()	-
contains()	Contains()	-
.	.	-
.	.	-

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Java	C#	Python
List
List	IList	l = [1, 2, 3]
		Add: l.append()
		Remove: l.remove()
		l.pop(index)
Set Type
		o
		o
		o
Mapping Type
		o
		o
		o
		o
		o
List / IList
		o
		o
		o