Yes, overloaded methods can be synchronized in java. Note: But you will get mutual exclusive problem if all methods are synchronized and you are using same object to invoke them. So, instead of using synchronized keyword at method level, try to follow below approach. class LoggerTest { private final Object LOCK = new Object(); … Read more
Yes, we can declare an overloaded method as static and another one as non-static. Example class SubtractionTest { public void subtraction(int num1, int num2) { System.out.println(num1 – num2); } public static void subtraction(int num1, int num2, int num3) { System.out.println(num1 – num2 – num3); } } public class Main { public … Read more
StringBuilder is faster one among string, stringbuffer and stringbuilder. Example public class Main { long startTime = 0l; long endTime = 0l; long timeDiff = 0l; // Concatenates to String public void concat1(String website) { startTime = System.nanoTime(); website = website + ".com"; endTime = System.nanoTime(); timeDiff = endTime – startTime; System.out.println("Time taken by String: … Read more
No, we cannot declare interface methods as static because static methods can not be overridden. Example interface Test1 { static void show(); } public class Main { void show(){ System.out.println("Implmented method."); } public static void main(String[] args) { Main object = new Main(); object.show(); } }interface Test1 { static void show(); } public … Read more
Yes, a class can implement two two interfaces with the same method signature but that method should be implemented only once in the class. Example interface Test1 { void show(); } interface Test2 { void show(); } public class Main { void show(){ System.out.println("Implemented method."); } public static void main(String[] args) { Main object … Read more
The java.lang package is always imported by default in java.
No, Map is not a Collection type because it does not inherit from Collection interface. Collection Hierarchy Map Hierarchy
Priority of Garbage Collector thread will be low. This is because of reason that the process of GC running is expensive, so rather than interrupt critical tasks it should only be done when the system has time to do. It is worked on the real time concept that is “do the unimportant task in the … Read more
No, array size cannot be negative. If we specify array size as negative, there will be no compile time error. But there will be run time NegativeArraySizeException. Example class Main { public static void main(String[] args) { int[] testArray = new int[4]; for (int i = 0; i < testArray.length; ++i) { System.out.println(testArray[i]); … Read more
No, “abc” is not a primitive value. It is a string object. Example public class Main{ void show(){ System.out.println("abc".getClass().getName()); } public static void main(String args[]){ Main obj=new Main(); obj.show(); } }public class Main{ void show(){ System.out.println("abc".getClass().getName()); } public static void main(String args[]){ Main obj=new Main(); obj.show(); } } Output java.lang.Stringjava.lang.String