What is the difference between using an operator and () parenthesis in Java?

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In Java, operators are used to perform specific operations on variables or expressions, while parentheses are used to group expressions, prioritize operations, or pass arguments to a method.

For example, the mathematical operator + is used to add two numbers together:

int sum = 1 + 2;

In this case, the operator "+" performs the addition operation.

On the other hand, parentheses are used in various ways. For example, when grouping expressions:

int result = (1 + 2) * 3;

In this case, the parentheses group the addition operation before multiplying the result by 3.

Parentheses are also used when calling methods and passing arguments:

System.out.println("Hello world");

In this case, the parentheses indicate that we are calling the println method and passing a string argument "Hello world".

Overall, operators and parentheses serve different purposes in Java and are used in different contexts.