Multi Threading

Question : 34 of 44

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Assume you have a class that holds two private variables: a and b. Which of the following pairs can prevent concurrent access problems in that class? (Choose all that apply.)

public int read(){return a+b;} public void set(int a, int b){this.a=a;this.b=b;}
public synchronized int read(){return a+b;} public synchronized void set(int a, int b){this.a=a;this.b=b;}
public int read(){synchronized(a){return a+b;}} public void set(int a, int b){synchronized(a){this.a=a;this.b=b;}}
public int read(){synchronized(a){return a+b;}} public void set(int a, int b){synchronized(b){this.a=a;this.b=b;}}
public synchronized(this) int read(){return a+b;} public synchronized(this) void set(int a, int b){this.a=a;this.b=b;}
public int read(){synchronized(this){return a+b;}} public void set(int a, int b){synchronized(this){this.a=a;this.b=b;}}

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