Initialization problems in Java

We should consider the initialization problem in 2.Local variableJava is not initialized by default. Therefore, you must initialize a local variable. Otherwise, nullpointerexception may occur. However,Instance variablesJava is initialized by default. We can not initialize it, but in a good habit, we should initialize it immediately when defining a variable, which is necessary.

Default initialization tables for various instance variables:
Default Value of variable type

Object Reference null
Byte, short, Int, long 0
Float, double 0.0
Boolean false
Char '/u0000'