Array of Objects in Java
James Hartman
What is An Array of Objects in Java?
Java Array Of Objects, as defined by its name, stores an array of objects. Unlike a traditional array that store values like string, integer, Boolean, etc an array of objects stores OBJECTS. The array elements store the location of the reference variables of the object.
Syntax:
Class obj[]= new Class[array_length]
How to Create Array of Objects in Java?
Step 1) Open your code editor. Copy the following code into an editor.
class ObjectArray{
public static void main(String args[]){
Account obj[] = new Account[2] ;
//obj[0] = new Account();
//obj[1] = new Account();
obj[0].setData(1,2);
obj[1].setData(3,4);
System.out.println("For Array Element 0");
obj[0].showData();
System.out.println("For Array Element 1");
obj[1].showData();
}
}
class Account{
int a;
int b;
public void setData(int c,int d){
a=c;
b=d;
}
public void showData(){
System.out.println("Value of a ="+a);
System.out.println("Value of b ="+b);
}
}
Step 2) Save your code.
Save, Compile & Run the Code.
Step 3) Error=?
Try and debug before proceeding to step 4.
Step 4) Check Account obj[] = new Account[2]
The line of code, Account obj[] = new Account[2]; exactly creates an array of two reference variables as shown below.
Step 5) Uncomment Line.
Uncomment Line # 4 & 5. This step creates objects and assigns them to the reference variable array as shown below. Your code must run now.
Output:
For Array Element 0 Value of a =1 Value of b =2 For Array Element 1 Value of a =3 Value of b =4
