How two different class threads communicate with each other?. send example code.

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When should I use abstract classes and when should I use interfaces?

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Can a constructor call the constructor of parent class?

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What class allows you to read objects directly from a stream in java programming?

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Is java hashset ordered?

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Explain the difference between extends thread vs implements runnable in java?

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How dead lock situation occurs in java and how you can identify it?

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What is void keyword?

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Why stringbuilder is not thread safe in java?

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public class Test { public static void main(String[] args) { int countA = 0; int countB = 0; int countC = 0; int countD = 0; int countE = 0; int countF = 0; int countG = 0; int countH = 0; int countI = 0; int countJ = 0; int countK = 0; int countL = 0; int countM = 0; int countN = 0; int countO = 0; int countP = 0; int countQ = 0; int countR = 0; int countS = 0; int countT = 0; int countU = 0; int countV = 0; int countW = 0; int countX = 0; int countY = 0; int countZ = 0; } } Can anybody tell me any alternate solution(like loop or something) to automate this initialization process. Ex:- for(char chr='A';chr<='Z'; chr++) { (int) String "count"+chr = 0; }

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Difference between association, composition and aggregation?

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What variables are stored in stack?

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