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What are aggregate functions explain with examples?
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Difference between an argument and a parameter?
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What is difference between an object and a class?
Explain access modifiers in java.
Variables used in a switch statement can be used with which datatypes?
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Differentiate between array list and vector in java.
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What are user defined exceptions?
If I will write String s=new String("XYZ"); String s1=new String("XYZ"); if(s.equals(s1)){ sop("True"); } else{ sop("False"); } This program will give me "True". But When I am creating my own class suppose class Employee{ public Employee(String name); } Employee e= new Employee("XYZ"); Employee e1 = neew Employee("XYZ"); if(e.equals(e1)){ sop("True"); } else{ sop("False"); } Then it will give the output as "False". Can I know what is happening internally?
If there is no implementation of MARKER INTERFACE in java. Then how compiler come to know about specification.
Core Java 
