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Detail Form
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1.
What is the output of the following Java code:
class Demo {
public static void main(String args[]) {
String s1 = "Hello World";
String s2 = s1.substring(0, 3);
System.out.println(s2);
}
}
public static void main(String args[]) {
String s1 = "Hello World";
String s2 = s1.substring(0, 3);
System.out.println(s2);
}
}
2.
In Java, which of the following classes is used to create an object with a mutable character sequence?
3.
In Java, the __________ method of the StringBuffer class is used to join the string representation to the end of an invoking string.
4.
What is the output of the following Java code:
class Demo {
public static void main(String args[]) {
StringBuffer s1 = new StringBuffer("Hello World");
s1.insert(6, "Good ");
System.out.println(s1);
}
}
public static void main(String args[]) {
StringBuffer s1 = new StringBuffer("Hello World");
s1.insert(6, "Good ");
System.out.println(s1);
}
}
5.
In Java, which of the following classes is not included in java.lang?
6.
In Java, which of the following is a method of the wrapper Float that is used to convert the value of an object into a byte?
7.
In Java, which of these is a super class of wrappers Long, Character and Integer?
8.
In Java, which of the following is a method of the wrapper Integer that is used to convert the value of an object into a byte?
9.
What is the output of the following Java code:
class Demo {
public static void main(String args[]) {
Integer i = new Integer(257);
byte x = i.byteValue();
System.out.print(x);
}
}
public static void main(String args[]) {
Integer i = new Integer(257);
byte x = i.byteValue();
System.out.print(x);
}
}
10.
What is the output of the following Java code:
class Demo {
public static void main(String args[]) {
Long i = new Long(256);
System.out.print(i.hashCode());
}
}
public static void main(String args[]) {
Long i = new Long(256);
System.out.print(i.hashCode());
}
}