Both languages have a type representing the logic values, true and false. Java calls the type boolean and uses the names (literals) true and false, whereas Python calls it Boolean and uses True and False. Note that in Python, the values 0 and "" will also be interpreted as false in a condition and all other values will be true, including True, of course.
Python's Boolean operators, and, or, and not have corresponding Java operators &&, || and !.
Logical Operators in Java boolean x = true;
boolean y = false;
// Output: x and y is false
System.out.println("x and y is " + (x && y));
// Output: x or y is true
System.out.println("x or y is " + (x || y));
// Output: not x is false
System.out.println("not x is " + !x);
| Logical Operators in Python x = True
y = False
# Output: x and y is False
print('x and y is',x and y)
# Output: x or y is True
print('x or y is',x or y)
# Output: not x is False
print('not x is',not x)
|
Negation is also formed differently between those two programming languages.
Operators in Java ! (x > 0 && y > 0) || z > 0 ^ w > 0 | Operators in Python not(x > 0 and y > 0) or z > 0 |
In Java, most of the comparison operators, >, <, >=, and <=, can be applied only to numerical types, while in Python, the comparison operators can be applied to numbers, strings, and other types of objects, and compare values in some appropriate way (e.g. numeric order, lexical order) where possible. The equality operators, == and !=, can be applied to any object, but when applied to reference types they test for same (different) object rather than same (different) value.
Negation in Java int x = 10;
int y = 12;
// Output: x > y is false
System.out.println("x > y is " + (x>y));
// Output: x < y is true
System.out.println("x < y is " + (x<y));
// Output: x == y is false
System.out.println("x == y is " + (x==y));
// Output: x != y is true
System.out.println("x != y is " + (x!=y));
// Output: x >= y is false
System.out.println("x >= y is " + (x>=y));
// Output: x <= y is true
System.out.println("x <= y is " + (x<=y));
| Comparison operators in Python x = 10
y = 12
# Output: x > y is False
print('x > y is',x>y)
# Output: x < y is True
print('x < y is',x<y)
# Output: x == y is False
print('x == y is',x==y)
# Output: x != y is True
print('x != y is',x!=y)
# Output: x >= y is False
print('x >= y is',x>=y)
# Output: x <= y is True
print('x <= y is',x<=y)
|
The comparison operators for numbers are the same as in Python. For class types, instead of == in Python, you should use the equals method in Java.