Call by value and call by reference in java
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Java uses call by value, where changes made to a parameter in a method are not reflected in the calling method. When an object is passed as a parameter, the reference value is passed by value, so changes to the object's fields will be visible in the calling method. The document provides examples of call by value using primitive types, where changes are not visible, and call by value using an object, where changes to the object's field are visible.
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![EXAMPLE OF CALL BY VALUE IN JAVA
class Operation{
int data=50;
void change(int data)
{
data=data+100;
}
public static void main(String args[]){
Operation op=new Operation();
System.out.println("before change "+op.data);
op.change(500);
System.out.println("after change "+op.data);
}
}
Output:before change 50
after change 50](https://image.slidesharecdn.com/callbyvalueandcallbyreferenceinjava-210812090009/85/Call-by-value-and-call-by-reference-in-java-3-320.jpg)
![class Operation2
{
int data=50;
void change(Operation2 op)
{
op.data=op.data+100;//changes will be in the instan
ce variable
}
public static void main(String args[])
{
Operation2 op=new Operation2();
System.out.println("before change "+op.data);
op.change(op);//passing object
System.out.println("after change "+op.data);
}
}
Output:before change 50
after change 150](https://image.slidesharecdn.com/callbyvalueandcallbyreferenceinjava-210812090009/85/Call-by-value-and-call-by-reference-in-java-5-320.jpg)
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Call by value and call by reference in java
- 1. CALL BY VALUE AND CALL BY REFERENCE IN JAVA PROF. SUNIL D. CHUTE DEPT. OF COMPUTER SCIENCE MG COLLEGE ARMORI
- 2. • There is only call by value in java, not call by reference. If we call a method passing a value, it is known as call by value. The changes being done in the called method, is not affected in the calling method.
- 3. EXAMPLE OF CALL BY VALUE IN JAVA class Operation{ int data=50; void change(int data) { data=data+100; } public static void main(String args[]){ Operation op=new Operation(); System.out.println("before change "+op.data); op.change(500); System.out.println("after change "+op.data); } } Output:before change 50 after change 50
- 4. ANOTHER EXAMPLE OF CALL BY VALUE IN JAVA • In case of call by reference original value is changed if we made changes in the called method. If we pass object in place of any primitive value, original value will be changed. In this example we are passing object as a value. Let's take a simple example:
- 5. class Operation2 { int data=50; void change(Operation2 op) { op.data=op.data+100;//changes will be in the instan ce variable } public static void main(String args[]) { Operation2 op=new Operation2(); System.out.println("before change "+op.data); op.change(op);//passing object System.out.println("after change "+op.data); } } Output:before change 50 after change 150