Java Articles - Page 634 of 745

The Assignment OperatorsFollowing are the assignment operators supported by Java language −OperatorDescriptionExample=Simple assignment operator. Assigns values from right side operands to left side operand.C = A + B will assign value of A + B into C+=Add AND assignment operator. It adds right operand to the left operand and assigns the result to left operand.C += A is equivalent to C = C + A-=Subtract AND assignment operator. It subtracts the right operand from the left operand and assigns the result to left operand.C -= A is equivalent to C = C � A*=Multiply AND assignment operator. It multiplies right ... Read More

Let us look at a simple code first that will print the words Hello World.ExampleLive Demopublic class MyFirstJavaProgram {    /* This is my first java program.        * This will print 'Hello World' as the output        */    public static void main(String []args) {       System.out.println("Hello World"); // prints Hello World    } }Let's look at how to save the file, compile, and run the program. Please follow the subsequent steps −Open notepad and add the code as above.Save the file as: MyFirstJavaProgram.java.Open a command prompt window and go to ... Read More

Let us look at a simple code first that will print the words Hello World.ExampleLive Demopublic class MyFirstJavaProgram {    /* This is my first java program.        * This will print 'Hello World' as the output        */    public static void main(String []args) {       System.out.println("Hello World"); // prints Hello World    } }Let's look at how to save the file, compile, and run the program. Please follow the subsequent steps −Open notepad and add the code as above.Save the file as: MyFirstJavaProgram.java.Open a command prompt window and go to ... Read More

If we compare a float and a double value with .5 or .0 or .1235 (ending with 5 or 0), then == operator returns true, otherwise it will return false. See the below example.ExampleLive Demopublic class Tester {    public static void main(String[] args) {       double d1 = 2.5;       float f1 = 2.5f;       System.out.println(d1 == f1);       double d2 = 2.4;       float f2 = 2.4f;       System.out.println(d2 == f2);    } }Outputtrue falseThe reason behind this logic is the approximation of float and ... Read More

If we compare a float and a double value with .5 or .0 or .1235 (ending with 5 or 0), then == operator returns true, otherwise it will return false. See the below example.ExampleLive Demopublic class Tester {    public static void main(String[] args) {       double d1 = 2.5;       float f1 = 2.5f;       System.out.println(d1 == f1);       double d2 = 2.4;       float f2 = 2.4f;       System.out.println(d2 == f2);    } }Outputtrue falseThe reason behind this logic is the approximation of float and ... Read More

When we assigned an int to Integer object, it is first converted to an Integer Object and then assigned. This process is termed as autoboxing. But there are certain things which you should consider while comparison of such objects using == operator. See the below example first.ExampleLive Demopublic class Tester {    public static void main(String[] args) {       Integer i1 = new Integer(100);       Integer i2 = 100;               //Scenario 1:       System.out.println("Scenario 1: " + (i1 == i2));       Integer i3 = ... Read More

When we assigned an int to Integer object, it is first converted to an Integer Object and then assigned. This process is termed as autoboxing. But there are certain things which you should consider while comparison of such objects using == operator. See the below example first.ExampleLive Demopublic class Tester {    public static void main(String[] args) {       Integer i1 = new Integer(100);       Integer i2 = 100;               //Scenario 1:       System.out.println("Scenario 1: " + (i1 == i2));       Integer i3 = ... Read More

The java.lang.Enum class is the common base class of all Java language enumeration types.Class DeclarationFollowing is the declaration for java.lang.Enum class -public abstract class Enum    extends Object       implements Comparable, SerializableWe can compare enum variables using the following ways.Using Enum.compareTo() method. compareTo() method compares this enum with the specified object for order.Using Enum.equals() method. equals() method returns true if the specified object is equal to this enum constant.Using == operator. The == operator checks the type and makes a null-safe comparison of the same type of enum constants.ExampleLive Demopublic class Tester {    // enum showing topics ... Read More

The java.lang.Enum class is the common base class of all Java language enumeration types.Class DeclarationFollowing is the declaration for java.lang.Enum class -public abstract class Enum    extends Object       implements Comparable, SerializableWe can compare enum variables using the following ways.Using Enum.compareTo() method. compareTo() method compares this enum with the specified object for order.Using Enum.equals() method. equals() method returns true if the specified object is equal to this enum constant.Using == operator. The == operator checks the type and makes a null-safe comparison of the same type of enum constants.ExampleLive Demopublic class Tester {    // enum showing topics ... Read More

Prior to Java 2, Java provided ad hoc classes such as Dictionary, Vector, Stack, and Properties to store and manipulate groups of objects. Although these classes were quite useful, they lacked a central, unifying theme. Thus, the way that you used Vector was different from the way that you used Properties.The collections framework was designed to meet several goals, such as −The framework had to be high-performance. The implementations for the fundamental collections (dynamic arrays, linked lists, trees, and hash tables) were to be highly efficient.The framework had to allow different types of collections to work in a similar manner ... Read More