How to define variables in java

1. If you want to use Java to represent a number: 100. Then you need to assign it to a variable and define the data type and name for it, similar to this:

Define variables

int number = 100;

2. You can also temporarily not initialize it, and then assign a value to the variable when certain combined calculations are needed:

Declare the variable without initializing the value

int sum;
sum = 1+1;
System.out.println(sum);

Local declaration If a variable is not assigned a value, it cannot be used directly.

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