How to define an Abstract class?

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A class containing abstract method is called Abstract class. An Abstract class can't be instantiated.
Example of Abstract class:
abstract class testAbstractClass {
protected String myString;
public String getMyString() {
return myString;
}
public abstract string anyAbstractFunction();
}

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How many methods in the Serializable interface?
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How to define an Abstract class?
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How to define an Interface?
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