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Java has two kinds of exceptions:
1. Checked exception: handled from java.lang.Exception but not java.lang.RuntimeException.
2. Unchecked exception: handled from java.lang.RuntimeException thrown by JVM.
EJB has two kinds of exceptions:
1. System Exception : is an unchecked exception produced from java.lang.RuntimeException. An EJBException is an unchecked exception, which is started from java.lang.RuntimeException.
2. Application Exception : is generic to an application and thrown because of violation of business rules. An Application Exception is a checked exception that is either described by the bean developer and does not import java.rmi.RemoteException.
A System Exception is given by the system and is not recoverable. Because the System Exceptions are unpredictable when they occur, the EJB container is the only one responsible for trapping the System Exceptions. The container usually wraps any RuntimeException in RemoteException, which subsequently puts thrown to the caller. In addition to intercepting System Exception the container can give the errors.
The hashCode() and equals() methods have to be very important, when objects implementing these two functions are added to collections. If not implemented or implemented incorre
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Explain the Rules for toString() Methods ? toString() methods should return a single line of text that does not contain any carriage returns or linefeeds. toString() methods
what is the job of it
To simplify complex class diagrams you may group classes into packages.
What is the String Concatenation + Operator is employed to concatenate strings - System.out.pritln ("Hello" + "World") will print Hello World on console String concatenat
Each time an object is started in Java it goes into the area of memory named as heap. The primitive variables like double and int are allocated in the stack, if they are local inst
Each time an object is operated in Java, it goes into the area of memory named as heap. The Java heap is named the garbage collectable heap. The garbage collection may not be force
Problem 1 Explain and Define the following concepts with appropriate examples a) Superclass b) Subclass c) Inheritance d) Exceptions e) Stream classes >>Defining and expl
Create a class HourlyWorker mind: particularHourlyWorker employee. • Declare two data members named wage and hours of double type with private access. • Implement a parameterized c
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