Core Java Interview Question

Core Java Interview Question

1.Explain JDK,JRE,JVM.

Java Virtual Machine(JVM):The abstract machine which provides the runtime environment
for java bytecode execution.

JDK(Java Development Kit):exist physically wthe JRE+ development tools.

Java Runtime Environment(JRE):implments JVM .

2.How many memory types allocated to Java virtual machine(JVM)?

a.Class
b.Stack
c.Heap
d.Program counter register
e.Native stack method

3.The definitions provided by java virtual machine
3.1.Memory area
3.2.Class file format
3.3.Register sets
3.4.Garbage collection heap
3.5.Fatal error reporting

4.Design Pattern in Java:A well proved solution for solving the specific problem or task.There are
    two design patterns of Java
4.1.Core java or JSE patterns
4.2.JEE design patterns