Which of the following is / are valid code?
a) System.out.println(Integer.add(2,2));
b) Float[] ar= new Float[] { new Float(1.0), new Float(2.1)};
c) System.out.println(Integer.toBinaryString(4));
d) System.out.println(Integer.cat(2,2));
e) System.out.println(Integer.toOctalString(4));
System.out.println(Integer.add(2,2));
a) System.out.println(Integer.add(2,2));
a) System.out.println(Integer.add(2,2))
This is not valid code. There is no static method called "add" in the Integer class. The correct method is "sum".
b) Float[] ar= new Float[] { new Float(1.0), new Float(2.1)}
This is valid code. It creates an array of Float objects and initializes it with two Float values.
c) System.out.println(Integer.toBinaryString(4))
This is valid code. It prints the binary representation of the integer 4.
d) System.out.println(Integer.cat(2,2))
This is not valid code. There is no static method called "cat" in the Integer class.
e) System.out.println(Integer.toOctalString(4))
This is valid code. It prints the octal representation of the integer 4.
To determine which of the given code options are valid, let's go through each option one by one:
a) System.out.println(Integer.add(2,2));
This is not valid code. The Integer class in Java does not have a static method called "add". If you want to add two integers, you can simply use the '+' operator, like this: System.out.println(2 + 2);
b) Float[] ar = new Float[] { new Float(1.0), new Float(2.1)};
This is valid code. It declares and initializes a Float array named 'ar' with two Float objects.
c) System.out.println(Integer.toBinaryString(4));
This is valid code. The Integer class in Java has a static method called "toBinaryString", which returns a binary string representation of the specified integer.
d) System.out.println(Integer.cat(2,2));
This is not valid code. The Integer class in Java does not have a static method called "cat". There is no predefined method to concatenate two integers directly. If you want to concatenate two integers as strings, you can use the '+' operator and convert the integers to strings, like this: System.out.println(Integer.toString(2) + Integer.toString(2));
e) System.out.println(Integer.toOctalString(4));
This is valid code. The Integer class in Java has a static method called "toOctalString", which returns an octal string representation of the specified integer.
So, the valid code options are:
b) Float[] ar = new Float[] { new Float(1.0), new Float(2.1)};
c) System.out.println(Integer.toBinaryString(4));
e) System.out.println(Integer.toOctalString(4));