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How can I enable the assert keyword in Eclipse?
public class A { public static void main(String ... args) { System.out.println(1); assert false; System.out.println(2); } } 
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To configure assertion options one must use either the -ea or -da command line flags to enable or disable assertions with the command line tool: “java”. For example, “java -ea Assert” where Assert is a java class file. You may also specify a specific class or package as follows.
Assertions can be selectively enabled or disabled at class level or package level. The disable switch is –disableassertions or –da for short. For example, the following command enables assertions in package package1 and disables assertions in class Class1. Assertion should not be used to replace exception handling.
Java For Testers An assertion is a statement in Java which ensures the correctness of any assumptions which have been done in the program. When an assertion is executed, it is assumed to be true. If the assertion is false, the JVM will throw an Assertion error. It finds it application primarily in the testing purposes.
To be specific:
Run->run configuration java application in left nav pan.select New.Arguments tab-ea in VM arguments.
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If anyone wants to enable assertions by default (in contrast to enabling them for just a single run configuration), it is possible with the following steps:
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