With one or two operands, expressions carry out particular actions based on an operator. A constant, a variable, or a function result can all be operands. There are three types of operators: arithmetic, logical, and relational.
A Java program's job is done by expressions. Expressions are used to compute and assign values to variables, as well as to regulate the flow of a program's execution. An expression's job is twofold: it must do the computation specified by the expression's constituents and return a value.
In Java, an operator is a set of symbols that performs operations on one, two, or three operands and then returns a result. The operators are categorised and presented in ascending order of precedence. The most common usage of Java operators is to alter primitive data types.