Upcast and Downcast in Java
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Upcast means to create an object of the sub(child) class and access methods and variables of the child class using the child class object.
package Tutorial_01;
public class MainClass extends TestOne{
int x = 50000;
void TestResult()
{
System.out.println("Child Class Values...:"+x);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
///-------------Upcast Example--------------------------------------
MainClass z = new MainClass(); // new object(child class object)
z.TestResult();
}
}
Downcast means to create an object of extend class (parent class) and access methods and variables of parent class using parent class object.
package Tutorial_01;
public class TestOne {
int x = 1000;
void TestResult()
{
System.out.println("Parent Class Values...:"+x);
}
}
package Tutorial_01;
public class MainClass extends TestOne{
int x = 50000;
void TestResult()
{
System.out.println("Child Class Values...:"+x);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
////----------DownCast Example----------------------------------------
TestOne y = new TestOne(); // new obj (parent class object)
y.TestResult();
}
}
