Can I use openjdk for commercial?

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Can we use lambda without functional interface?

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What is stateful 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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What is a java proxy?

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What are the new features about Java se 8 ?

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What is java ioc?

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What is use of jpa?

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Please can anybody explain what exactly "the project architecture" means???

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What is loose coupling in java?

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Explain the reason for each keyword of public static void main(string args[])?

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explain isalive() method under thread class?

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