Primitive Class

import java.util.*;
import java.lang.reflect.Array;
import static java.lang.System.out;

public class Main {

  static Map<String, Class<?>> primitiveClass = new HashMap<String, Class<?>>();
  static {
    primitiveClass.put("boolean", Boolean.TYPE);
    primitiveClass.put("byte", Byte.TYPE);
    primitiveClass.put("char", Character.TYPE);
    primitiveClass.put("short", Short.TYPE);
    primitiveClass.put("int", Integer.TYPE);
    primitiveClass.put("long", Long.TYPE);
    primitiveClass.put("float", Float.TYPE);
    primitiveClass.put("double", Double.TYPE);
  }
  
  public static Class<?> findClass(String className) throws ClassNotFoundException {
    Class<?> c =primitiveClass.get(className);
    if (c == null)
    c = Class.forName(className);
    return c;
  }
  
  private static void printArrayClass(Class<?> componentType) {
    Object array = Array.newInstance(componentType, 0);
    out.println(array.getClass().getCanonicalName());
  } 

  public static void main(String[] args) throws ClassNotFoundException {

    Class<?>[] classes = new Class[] {int.class, Integer.TYPE,  Integer.class};
    for (Class<?> c : classes) {
      printArrayClass(c);
    }
    out.println();
    
    String[] cns = new String[]{"int", "java.lang.Integer"};
    for (String c : cns) {
      printArrayClass(findClass(c));
    }
    
  }
}
/*
int[]
int[]
java.lang.Integer[]

int[]
java.lang.Integer[]
*/