- 1 When a method’s type is an object what is actually returned by the calling program?
- 2 When the this variable is used to call a constructor?
- 3 What is the return type of a method that does not return any value?
- 4 When an object is passed as an argument it is actually a reference to the object that is passed?
- 5 What is required for an interface method that has a body?
- 6 What does UML diagram entry mean setHeight H double void?
- 7 Can we override the static method?
- 8 What is true private constructor?
- 9 Can a constructor call another constructor Java?
- 10 Is void a return type?
- 11 Which method Cannot be overridden?
- 12 What type of value can a function return?
- 13 When an object is passed to a method what is actually passed?
- 14 When an argument is passed by value?
- 15 What is stored by a reference variable?
When a method’s type is an object what is actually returned by the calling program?
When a method’s return type is an object, what is actually returned to the calling program? only one copy of the field in memory.
When the this variable is used to call a constructor?
The this variable can be used to call the another constructor it is also point the current object. if we using this variable to call another constructor then their must be restriction that it must be a first statement in the constructor otherwise compiler gives an error in the program.
What is the return type of a method that does not return any value?
1. What is the return type of a method that does not return any value? Explanation: Return type of a method must be made void if it is not returning any value. 2.
When an object is passed as an argument it is actually a reference to the object that is passed?
When an object, such as a String, is passed as an argument, it is actually a reference to the object that is passed. The contents of a String object cannot be changed. When passing multiple arguments to a method, the order in which the arguments are passed is not important.
What is required for an interface method that has a body?
What is required for an interface method that has a body? The method header must begin with the key word default. ClassB must override each method in ClassA.
What does UML diagram entry mean setHeight H double void?
What does the following UML diagram entry mean? + setHeight(h: double): void. This is a public method with a parameter of data type double and does not return a value. Methods that operate on an object’s fields are called. instance methods.
Can we override the static method?
Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.
What is true private constructor?
What is true about private constructor? Explanation: Object of private constructor can only be created within class. Private constructor is used in singleton pattern. It should create and return new objects.
Can a constructor call another constructor Java?
Yes, any number of constructors can be present in a class and they can be called by another constructor using this() [Please do not confuse this() constructor call with this keyword]. this() or this(args) should be the first line in the constructor. This is known as constructor overloading.
Is void a return type?
Void functions are created and used just like value–returning functions except they do not return a value after the function executes. You may or may not use the return statement, as there is no return value. Even without the return statement, control will return to the caller automatically at the end of the function.
Which method Cannot be overridden?
A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.
What type of value can a function return?
A return value can be any one of the four variable types: handle, integer, object, or string. The type of value your function returns depends largely on the task it performs.
When an object is passed to a method what is actually passed?
When an object is passed as an argument to a method, this is actually passed. this is the name of a reference variable that is always available to an instance method and refers to the object that is calling the method. This array field holds the number of elements that the array has.
When an argument is passed by value?
Pass by value means that a copy of the actual parameter’s value is made in memory, i.e. the caller and callee have two independent variables with the same value. If the callee modifies the parameter value, the effect is not visible to the caller.
What is stored by a reference variable?
A reference variable is a variable that points to an object of a given class, letting you access the value of an object. An object is a compound data structure that holds values that you can manipulate. A reference variable does not store its own values.