How to initialize variables in Java?

2 years ago
Noah Thompson
1 minute

In Java, variables can be initialized in the following ways:

  1. Variables should be declared first, and then assigned initial values separately.
  2. Declare a variable called ‘num’ and assign it the value of 10.
  3. Assign a value while declaring a variable: When declaring a variable, assign an initial value to it at the same time.
  4. Declare a variable and assign the value of 10.
  5. Initialize in the constructor: Initializing variables in a class using the constructor.
  6. The num variable is initialized in the constructor.
  7. Initialize in the instance initialization block: Initialize variables using the instance initialization block.
  8. The variable “num” is initialized to 10 in the instance initialization block of MyClass.

It is important to note that local variables must be initialized before use, otherwise the compiler will throw an error. However, member variables have default initial values. For example, integer type member variables default to 0, boolean type member variables default to false, and reference type member variables default to null.

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