Where is singleton design pattern used in java?

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Do I need to install jre if I have jdk?

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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 lsdou? : java security

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Why oracle type 4 driver is named as oracle thin driver?

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What is java flatmap?

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when a program class implements an interface it must provide behavior for..?

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What is log4j in java?

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

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What is spliterator in java se 8?

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is hibernate a technology or framework?

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What is loose coupling in java?

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