Generic Method to Print Array Elements in Java

Generics in Java enable programmers to provide compile-time type-safety.

There are some main benefits of using generics in Java such as :

1-) Strong type-checking
2-) Elimination of casts
3-) Provide a way to develop generic algorithms

Methods can also be designed in a generic fashion in Java, too. Following generic method prints all the elements of an array one-by-one in a for-loop for both wrapper types and custom defined types.

package basics;

public class GenericPrint {

 static class Employee
 {
  String name;
  Employee(String pName)
  {
   name = pName;
  }
  
  public String toString() {
   return "[Employee Name = "+name+" ]";
  }
 }
 
 // Generic method
 public static <T> void print( T[] inParam )
 {
  for( T t: inParam )
  {
   System.out.printf("%s ", t);
  }
 }
 
 
 public static void main(String[] args) {
  
  String[] strArr = {"D1","D2","D3","D4"};  
  print(strArr);
  
  Integer[] intArr = { 1,2,3 };
  System.out.println();
  print(intArr);
  
  Double[] dArr = { 5.5, 6.6, 7.7 };
  System.out.println();
  print(dArr);
    
  Employee e1 = new Employee("Emply1");
  Employee e2 = new Employee("Emply2");
  Employee e3 = new Employee("Emply3");
  
  Employee[] empArr = { e1, e2, e3 };
  
  System.out.println();
  print(empArr);  
 } 
}

Create a GenericPrint.java file in your workspace.

When the main method inside the GenericPrint class executed it is going to print :

D1 D2 D3 D4
1 2 3
5.5 6.6 7.7
[Employee Name = Emply1 ] [Employee Name = Emply2 ] [Employee Name = Emply3 ]