Rotate 2-D matrix by 90

Given N*M matrix, rotate it by 90 degree right

package core.geeks;

class Rotate90Degree {

      

       private static void rotateMatrix(int[][] array) {

              int oRow = array.length;

              int oCol = array[0].length;

              int[][] tArr = new int[oCol][oRow];

              int tCol = 3;

              for (int i = 0; i < oRow; i++){

                     for(int j = 0;  j < oCol; j++){

                           tArr[j][tCol] = array[i][j];

                     }

                     tCol--;

              }

              printGrid(tArr);

       }

      

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

              int[][] array = {  {0, 1, 2, 3, 4},

                           {5, 6, 7, 8, 9},

                           {10, 11, 12, 13, 14},

                           {15, 16, 17, 18, 19}};

              rotateMatrix(array);

       }

       public static void printGrid(int[][] a) {

              for(int i = 0; i < a.length; i++) {

                     for(int j = 0; j < a[i].length; j++) {

                           System.out.printf("%5d ", a[i][j]);

                     }

                     System.out.println();

              }

       }

}

Output:

   15    10     5     0

   16    11     6     1

   17    12     7     2

   18    13     8     3

   19    14     9     4

Singleton beans scopes in Spring

Beans with different Id’s have Singleton instance

singleton: (Default) Scopes a single bean definition to a single object instance per Spring IoC container.

NO, Similar beans with different ids make the different instance (Even scope is defined as Singleton); because the singleton scope checked on the basis of bean ids.

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

       http://www.springframework.org/schema/beans/spring-beans.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context-4.0.xsd"

       default-autowire="byName" default-autowire-candidates="*">

       <context:annotation-config />

       <bean id="id1" class="spring.core.singleton.Singleton">

              <property name="name" value="Rajesh kumar"></property>

       </bean>

       <bean id="id2" class="spring.core.singleton.Singleton">

              <property name="name" value="Awadh kumar"></property>

       </bean>

</beans>

package spring.core.singleton;

public class Singleton {

      

       private String name;

       public String getName() {

              return name;

       }

       public void setName(String name) {

              this.name = name;

       }

}

package spring.core.singleton;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestSingletonScope {

       public static void main(String[] args) {

              ApplicationContext appContext = new ClassPathXmlApplicationContext

                           ("spring/core/singleton/autowiring-spring.xml");

             

              Singleton singleton1 = appContext.getBean("id1", Singleton.class);

             

              Singleton singleton2 = appContext.getBean("id2", Singleton.class);

             

             

              System.out.println(singleton1.getName());

              System.out.println(singleton2.getName());

              if(singleton1==singleton2) {

                     System.out.println("singleton");

              } else {

                     System.out.println("not singleton");

              }

       }

}

Output:

Rajesh kumar

Awadh kumar

not singleton