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Java Articles
Page 110 of 450
clone() method in Java
Java provides an assignment operator to copy the values but no operator to copy the object. Object class has a clone method which can be used to copy the values of an object without any side-effect. Assignment operator has a side-effect that when a reference is assigned to another reference then a new object is not created and both the reference point to the same object. This means if we change the value in one object then same will reflect in another object as well. clone() method handles this problem. See the below example.Examplepublic class Tester { public static ...
Read MoreComparison of autoboxed integer object in Java
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.Examplepublic 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 = 100; ...
Read Moreclone() method in Java
Java provides an assignment operator to copy the values but no operator to copy the object. Object class has a clone method which can be used to copy the values of an object without any side-effect. Assignment operator has a side-effect that when a reference is assigned to another reference then a new object is not created and both the reference point to the same object. This means if we change the value in one object then same will reflect in another object as well. clone() method handles this problem. See the below example.Examplepublic class Tester { public static ...
Read MoreComparison of double and float primitive types in Java
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.Examplepublic 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; double margin = 0.0000001; System.out.println(compareNumbers(d2, f2, margin)); } private static boolean compareNumbers(double d, float f, double margin) { if(Math.abs(d - f) < margin) { return true; } return false; } }Outputtrue true
Read MoreComparison of double and float primitive types in Java
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.Examplepublic 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; double margin = 0.0000001; System.out.println(compareNumbers(d2, f2, margin)); } private static boolean compareNumbers(double d, float f, double margin) { if(Math.abs(d - f) < margin) { return true; } return false; } }Outputtrue true
Read MoreCompilation and execution of Java Program
Let us look at a simple code first that will print the words Hello World.Examplepublic 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 the ...
Read MoreCompilation and execution of Java Program
Let us look at a simple code first that will print the words Hello World.Examplepublic 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 the ...
Read MoreAssigning long values carefully in java to avoid overflow
In case of having the operation of integer values in Java, we need to be aware of int underflow and overflow conditions. Considering the fact that in Java, The int data type is a 32-bit signed two's complement integer having a minimum value of -2, 147, 483, 648 and a maximum value of 2, 147, 483, 647. If a value goes beyond the max value possible, the value goes back to minimum value and continue from that minimum. In a similar way, it happens for a value less than the min value. Consider the following example.Examplepublic class Tester { ...
Read MoreAssigning long values carefully in java to avoid overflow
In case of having the operation of integer values in Java, we need to be aware of int underflow and overflow conditions. Considering the fact that in Java, The int data type is a 32-bit signed two's complement integer having a minimum value of -2, 147, 483, 648 and a maximum value of 2, 147, 483, 647. If a value goes beyond the max value possible, the value goes back to minimum value and continue from that minimum. In a similar way, it happens for a value less than the min value. Consider the following example.Examplepublic class Tester { ...
Read MoreAssigning values to static final variables in java
In java, a non-static final variable can be assigned a value at two places.At the time of declaration.In constructor.Examplepublic class Tester { final int A; //Scenario 1: assignment at time of declaration final int B = 2; public Tester() { //Scenario 2: assignment in constructor A = 1; } public void display() { System.out.println(A + ", " + B); } public static void main(String[] args) { Tester tester = new Tester(); ...
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