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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If a class is located in a package, what do you need to change in the OS environment to be able to use it?
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How to define an Interface?
How to define an Interface? In Java Interface defines the methods but does not implement them. Interface can include constants. A class that implements the interfaces is bound to implement all the methods defined in Interface. Emaple of Interface: public interface sampleInterface { public void funct... 2012-05-24, 2669👍, 0💬

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