What points should be paid attention to when initializing variables in java

1. Variables are fields in classes or structures. If there is no obvious initialization, the variable is created in a default state with a default initial value of 0.

2. The variables in the method must be explicitly initialized, otherwise an error will occur when using the variables.

Example

public class BedAndBreakfast {
 
    // initialize to 10
    public static int capacity = 10;
 
    // initialize to false
    private boolean full = false;
}

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