If one class havent the constructor, it has normal method, then can i use super keyword to call the method form the sub class and vice verse?

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How can I swap two variables without using a third variable?

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What is a service layer in java?

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What is a jpa repository?

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What is native api in java?

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public class Dog { private int weight; public int getweight(){ return weight; } public void SetWeight(int newWeight){ if (newWeight > 0){ weight = newWeight; } } } public class TestDog { public static void main(String[] args) { Dog d = new Dog(); System.out.println("Dog d's weight is " + d.getWeight()); d.setWeight(42); System.out.println("Dog d's weight is " + d.getWeight()); d.setweight(-42); System.out.println("Dog d's weight is " + d.getWeight()); } } class dog is compiled but there is an error in class TestDog when compiled and the error is with dot notations. I want to kmow why there is error in testdog class when compiled.

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how can we create the ui using netbeans,having the code?

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What is an entity in java?

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Explain the inheritance principle.

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Name primitive java types.

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What gives java it’s “write once and run anywhere” nature?

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In system.out.println(), what is system, out and println?

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