Vector addAll() Method in Java
- java.util.Vector.addAll(Collection C): This method is used to append all of the elements from the collection passed as a parameter to this function to the end of a vector keeping in mind the order of return by the collection’s iterator.
Syntax:
boolean addAll(Collection C)
Parameters: The method accepts a mandatory parameter C which is a collection of ArrayList. It is the collection whose elements are needed to be appended at the end of the vector.
Return Value: The method returns True if at least one action of append is performed, else False.
Below program illustrate the Java.util.Vector.addAll() method:
// Java code to illustrate boolean addAll()
import
java.util.*;
import
java.util.ArrayList;
public
class
GFG {
public
static
void
main(String args[])
{
// Creating an empty Vector
Vector<String> vt =
new
Vector<String>();
// Use add() method to add elements in the Vector
vt.add(
"Geeks"
);
vt.add(
"for"
);
vt.add(
"Geeks"
);
vt.add(
"10"
);
vt.add(
"20"
);
// A collection is created
Collection<String> c =
new
ArrayList<String>();
c.add(
"A"
);
c.add(
"Computer"
);
c.add(
"Portal"
);
c.add(
"for"
);
c.add(
"Geeks"
);
// Displaying the Vector
System.out.println(
"The Vector is: "
+ vt);
// Appending the collection to the vector
vt.addAll(c);
// Clearing the vector using clear() and displaying
System.out.println(
"The new vector is: "
+ vt);
}
}
Output:The Vector is: [Geeks, for, Geeks, 10, 20] The new vector is: [Geeks, for, Geeks, 10, 20, A, Computer, Portal, for, Geeks]
- java.util.Vector.addAll(int index, Collection C): This method is used to append all of the elements from the collection passed as a parameter to this function at a specific index or position of a vector.
Syntax:
boolean addAll(int index, Collection C)
Parameters: This function accepts two parameters as shown in the above syntax and are described below.
- index: This parameter is of integer datatype and specifies the position in the vector starting from where the elements from the container will be inserted.
- C: It is a collection of ArrayList. It is the collection whose elements are needed to be appended.
Return Value: The method returns True if at least one action of append is performed, else False.
Below program illustrate the Java.util.Vector.addAll() method:
// Java code to illustrate boolean addAll()
import
java.util.*;
import
java.util.ArrayList;
public
class
GFG {
public
static
void
main(String args[])
{
// Creating an empty Vector
Vector<String> vt =
new
Vector<String>();
// Use add() method to add elements in the Vector
vt.add(
"Geeks"
);
vt.add(
"for"
);
vt.add(
"Geeks"
);
vt.add(
"10"
);
vt.add(
"20"
);
// A collection is created
Collection<String> c =
new
ArrayList<String>();
c.add(
"A"
);
c.add(
"Computer"
);
c.add(
"Portal"
);
c.add(
"for"
);
c.add(
"Geeks"
);
// Displaying the Vector
System.out.println(
"The Vector is: "
+ vt);
// Appending the collection to the vector
vt.addAll(
1
, c);
// Clearing the vector using clear() and displaying
System.out.println(
"The new vector is: "
+ vt);
}
}
Output:The Vector is: [Geeks, for, Geeks, 10, 20] The new vector is: [Geeks, A, Computer, Portal, for, Geeks, for, Geeks, 10, 20]
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