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Java basics

assert


assert is a Java keyword used to define an assert statement. An assert statement is used to declare an expected boolean condition in a program. If the program is running with assertions enabled, then the condition is checked at runtime. If the condition is false, the Java runtime system throws a AssertionError.

Syntax:
assert expression1 [: expression2];


Example:

assert list != null && list.size() > 0 : "list variable is null or empty";
Object value = list.get(0);


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