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java: When use a method like the class Math method abs(), where is the code for...

java: When use a method like the class Math method abs(), where is the code for abs()? Where is its source code? Where is its compiled code? How does a call to abs() in my compiled code know where the open function resides in memory?

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Answer #1

Code for abs()

The code for abs() is defined in Math class which is in lang package of java

Source code of abs()

The source code for the abs() method is defined in Math class which is in lang package of java

Java\jdk1.8.0_181\src\java\lang\Math.java

Compiled Code for abs()

The compiled code for Math is defined in lang package of java

call to abs()

Whenever a java code is executed, all the methods will get memory, and as abs() is a method from the Math class it will also be assigned memory. When the method abs() is called, the jvm will fetch the memory location of the method and execute it

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