Assert in java eclipse

Assert is useful for for embedding runtime sanity checks in code. The static predicate methods all test a condition and throw some type of unchecked exception if the condition does not hold.

Assertion failure exceptions, like most runtime exceptions, are thrown when something is misbehaving. Assertion failures are invariably unspecified behavior; consequently, clients should never rely on these being thrown (or not thrown). If you find yourself in the position where you need to catch an assertion failure, you have most certainly written your program incorrectly.

Note that an assert statement is slated to be added to the Java language in JDK 1.4, rending this class obsolete.

Method Summary
static boolean	isLegal (boolean expression) Asserts that an argument is legal.
static boolean	isLegal (boolean expression, String message) Asserts that an argument is legal.
static void	isNotNull (Object object) Asserts that the given object is not null .
static void	isNotNull (Object object, String message) Asserts that the given object is not null .
static boolean	isTrue (boolean expression) Asserts that the given boolean is true .
static boolean	isTrue (boolean expression, String message) Asserts that the given boolean is true .

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

isLegal

public static boolean isLegal(boolean expression)

Asserts that an argument is legal. If the given boolean is not true , an IllegalArgumentException is thrown.

Parameters: expression — the outcome of the check Returns: true if the check passes (does not return if the check fails) Throws: IllegalArgumentException — if the legality test failed

isLegal

Asserts that an argument is legal. If the given boolean is not true , an IllegalArgumentException is thrown. The given message is included in that exception, to aid debugging.

Parameters: expression — the outcome of the check message — the message to include in the exception Returns: true if the check passes (does not return if the check fails) Throws: IllegalArgumentException — if the legality test failed

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isNotNull

Asserts that the given object is not null . If this is not the case, some kind of unchecked exception is thrown.

As a general rule, parameters passed to API methods must not be null unless explicitly allowed in the method’s specification. Similarly, results returned from API methods are never null unless explicitly allowed in the method’s specification. Implementations are encouraged to make regular use of Assert.isNotNull to ensure that null parameters are detected as early as possible.

Parameters: object — the value to test Throws: Throwable — an unspecified unchecked exception if the object is null

isNotNull

Asserts that the given object is not null . If this is not the case, some kind of unchecked exception is thrown. The given message is included in that exception, to aid debugging.

Parameters: object — the value to test message — the message to include in the exception Throws: Throwable — an unspecified unchecked exception if the object is null

isTrue

public static boolean isTrue(boolean expression)

Asserts that the given boolean is true . If this is not the case, some kind of unchecked exception is thrown.

Parameters: expression — the outcome of the check Returns: true if the check passes (does not return if the check fails)

isTrue

Asserts that the given boolean is true . If this is not the case, some kind of unchecked exception is thrown. The given message is included in that exception, to aid debugging.

Parameters: expression — the outcome of the check message — the message to include in the exception Returns: true if the check passes (does not return if the check fails)

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About the author

Daniel is a Technical Manager with over 10 years of consulting expertise in the Identity and Access Management space.
Daniel has built from scratch this blog as well as technicalconfessions.com
Follow Daniel on twitter @nervouswiggles

Comments

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How to enable the Java keyword assert in Eclipse program-wise?

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:

Window (menu bar)
Preferences
Java
Installed JREs
Select your JRE/JDK
Press Edit.
Default VM arguments
Add -ea

Solution 3 — Java

Form the menu bar, select Run -> Run Configurations. .
Select Arguments tab.
Add -ea to VM arguments .
Click Apply .
Click Run .

Solution 4 — Java

You need to go to run configurations and add vm arguments as «-enableassertions» (or) «-ea»

After that when you run code with assert statement, you will see assert in action.

Solution 5 — Java

Java introduced the assert keyword, so the way to enable source-level support is to make sure that Eclipse’s Java compliance level is 1.4 or higher. (The chances are that the compliance level is already higher than that . )

To cause a Java application launched from Eclipsed to run with assertion checking enabled, add the «-ea» argument to the VM arguments in the launcher configuration’s «Arguments» tab.

Solution 6 — Java

In case someone uses IDEA, -ea is enabled by default in some IDEA versions, but disabled in others. To manually configure it, it is under run -> edit configuration -> vm option

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Assert in java eclipse