What is the super class of every class in Java?

Updated on 30-Jul-2019 22:30:20

4K+ Views

The class named Object is the super class of every class in Java. Let’s test it with an example. The java.lang.Class.getSuperclass() returns the Class representing the superclass of the entity (class, interface, primitive type or void) represented by this Class. So, Create a sample concrete class and lets try to get the name of its super class using this method. Example Live Demo public class Test { public static void main(String args[]){ Test obj = new Test(); Class cls = obj.getClass().getSuperclass(); ... Read More

How to declare a local variable in Java?

Johar Ali
Updated on 30-Jul-2019 22:30:20


Local variables are declared in methods, constructors, or blocks. Local variables are created when the method, constructor or block is entered and the variable will be destroyed once it exits the method, constructor, or block. A local variable is the one which is declared within a method. The scope of this variable is within the method. Example public abstract class Sample { public static void main(String args[]){ int data = 4044; System.out.println(data); } } Output 4044

What is the scope of public access modifier in Java?

Paul Richard
Updated on 30-Jul-2019 22:30:20


The public modifier has the widest scope. When a class or its members declared public they are accessible from everywhere. A default class or its members are available to any other class in the same package. However, if the public class we are trying to access is in a different package, then the public class still needs to be imported. Because of class inheritance, all public methods and variables of a class are inherited by its subclasses. Example The following function uses public access control − public static void main(String[] arguments) { // ... } ... Read More

Error while connecting to SAP server from Java application: java.lang.UnsatisfiedLinkError: no sapjco3 in java.library.path

SAP Developer
Updated on 30-Jul-2019 22:30:20


Note that SAP Java Connector should be configured as server library and not as application library.There are many issues in the way you are trying to use:You shouldn’t change java.library.path programmatically as it is not recommended and this is cached at JVM start.You are overwriting java.library.path instead of adding your directory so your application server requires native libraries.Also note that our JVM root directory is different from your application root directory so /WEB-INF/lib path won’t be found by our JVM. 

What is a method signature in Java?

Swarali Sree
Updated on 30-Jul-2019 22:30:20

5K+ Views

The method signature consists of the method name and the parameter list. Example Live Demo public class MethodSignature { public int add(int a, int b){ int c = a+b; return c; } public static void main(String args[]){ MethodSignature obj = new MethodSignature(); int result = obj.add(56, 34); System.out.println(result); } } Output 90 Method ... Read More

Can static variables be called using className.variableName in Java?

Rahul Sharma
Updated on 30-Jul-2019 22:30:20

1K+ Views

Class variables also known as static variables are declared with the static keyword There would only be one copy of each class variable per class, regardless of how many objects are created from it. You can access a class variable without instantiation using the class name as className.variableName. Example Live Demo public class Test{ static int num = 92; public static void main(String args[]) throws Exception { System.out.println(Test.num); } } Output 92

Alter SAP standard code not working

Updated on 30-Jul-2019 22:30:20


As you have mentioned you require access key for the change to be complete, but this key is mapped to SAP specific installation. In short, you need to retrieve this key from the SAP.I would still suggest not to go for the change. You can seek other alternatives for this. You can analyze the feasibility of implicit enhancements usage. The reason I am recommending alternatives is whenever you would have an upgrade in SAP, you would require a change which is cumbersome.

What is the number wrapper class and its methods in Java?

Updated on 30-Jul-2019 22:30:20


The Number class (abstract) of the java.lang package represents the numeric values that are convertible to primitive types byte, double, float, int, long, and short. Following are the method provided by the Number class of the java.lang package. Sr.No Method & Description 1 byte byteValue() This method returns the value of the specified number as a byte. 2 abstract double doubleValue() This method returns the value of the specified number as a double. 3 abstract float floatValue() This method returns the value of the specified number as a float. ... Read More