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Can we implement one interface from another in java?
No, we cannot implement one interface from another you can just extend it using the extends keyword as −
interface ArithmeticCalculations{
public abstract int addition(int a, int b);
public abstract int subtraction(int a, int b);
}
interface MathCalculations implements ArithmeticCalculations{
public abstract double squareRoot(int a);
public abstract double powerOf(int a, int b);
}Still, if you try to implement one interface from another using the implements keyword. The compiler does not recognize the implements keyword after the name of the interface and throws a compile time error saying “'{' expected”.
Example
In the following Java program, we have two interfaces namely, ArithmeticCalculations and MathCalculations and, we are trying to implement on interface from the other.
interface ArithmeticCalculations{
public abstract int addition(int a, int b);
public abstract int subtraction(int a, int b);
}
interface MathCalculations implements ArithmeticCalculations{
public abstract double squareRoot(int a);
public abstract double powerOf(int a, int b);
}Compile time error
On compiling, the above program generates the following compile time error −
Output
MathCalculations.java:8: error: '{' expected
interface MathCalculations implements ArithmeticCalculations{
^
1 errorIf you compile the same program using eclipse it gives you a compile time error suggesting that “extends keyword is expected instead of implements”.
Updated on 29-Jun-2020 14:35:20
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