Pre-Employment tests - Revision history

Fukakai: /* Java: Equality Test - Strings & Integers */

2019-08-30T02:49:42Z

Java: Equality Test - Strings & Integers

← Older revision		Revision as of 04:49, 30 August 2019
Line 44:		Line 44:
	* Biometric datas		* Biometric datas
	=Standard Traps (in Java)=		=Standard Traps (in Java)=
	~~==Java: Equality Test - Strings & Integers==~~
	~~/** Exec: http://tpcg.io/UxQq4J */~~
	public class EqualityTest{		public class EqualityTest{
	/**		/**
	* In Java, string equals() method compares the two given strings		* In Java, string equals() method compares the two given strings
	* based on the data/content of the string		* based on the data/content of the string
	**/		**/
	public static void main(String []args){		public static void main(String []args){
	System.out.println("########## Testing Strings ##########");		System.out.println("########## Testing Strings ##########");
	testStrings();		testStrings();
	System.out.println("########## Testing Numbers ##########");		System.out.println("########## Testing Numbers ##########");
	testNumbers();		testNumbers();
	}		}

	public static void testStrings(){		public static void testStrings(){
	String a = "test";		String a = "test";
	String b = "test";		String b = "test";
			String c = "TEST";
	String objA = new String("test");		String objA = new String("test");
	String objB = new String("test");		String objB = new String("test");

			System.out.println("#### - A - ####");
	System.out.println(a==b); //true		System.out.println(a==b); //true
	System.out.println(objA==objB); //false		System.out.println(objA==objB); //false
	System.out.println(a==objA); //false		System.out.println(a==objA); //false
			System.out.println(a.hashCode()); //3556498

			System.out.println("#### - B - ####");
	System.out.println(a.equals(b)); //true		System.out.println(a.equals(b)); //true
	System.out.println(objA.equals(objB)); //true		System.out.println(objA.equals(objB)); //true
	System.out.println(a.equals(objA)); //true		System.out.println(a.equals(objA)); //true
			System.out.println(b.hashCode()); //3556498
	}
	~~public static void testNumbers~~(){
	~~int one = 1;~~
	~~int two = 1;~~
	~~int objOne = new Integer~~(1);
	~~int objTwo = new Integer(1~~);

	System.out.println(~~one==two~~); ~~//true~~		System.out.println("#### - C - ####");
	System.out.println(~~objOne~~==~~objTwo~~); //~~true~~		System.out.println(a==c); //false
	System.out.println(~~one==objOne~~); //~~true~~		System.out.println(c.hashCode()); //2571410

	// error: int cannot be dereferenced		}
	//System.out.println(one.equals(two));		public static void testNumbers(){
	//System.out.println(objOne.equals(objTwo));		int one = 1;
	//System.out.println(one.equals(objOne));		int two = 1;
			int objOne = new Integer(1);
	}		int objTwo = new Integer(1);

			System.out.println(one==two); //true
			System.out.println(objOne==objTwo); //true
			System.out.println(one==objOne); //true

			// error: int cannot be dereferenced
			//System.out.println(one.equals(two));
			//System.out.println(objOne.equals(objTwo));
			//System.out.println(one.equals(objOne));

			}
	}		}

Fukakai: /* SQL: Tests with Null */

2019-08-23T21:03:17Z

SQL: Tests with Null

← Older revision		Revision as of 23:03, 23 August 2019
Line 124:		Line 124:

	==SQL: Tests with Null==		==SQL: Tests with Null==
	/** Exec: jdoodle.com/a/1sJB */		/** Exec: https://jdoodle.com/a/1sJB */
	create table sample(id int not null, name varchar);		create table sample(id int not null, name varchar);

Fukakai: /* SQL: Tests with Null */

2019-08-23T21:03:03Z

SQL: Tests with Null

← Older revision		Revision as of 23:03, 23 August 2019
Line 124:		Line 124:

	==SQL: Tests with Null==		==SQL: Tests with Null==
			/** Exec: jdoodle.com/a/1sJB */
	create table sample(id int not null, name varchar);		create table sample(id int not null, name varchar);

Fukakai: /* Invalid Code */

2019-08-23T20:54:08Z

Invalid Code

← Older revision		Revision as of 22:54, 23 August 2019
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	==Java: Inheritance Test ==		==Java: Inheritance Test ==
	===Invalid Code===		===Invalid Code===
	/** Exec : http://tpcg.io/~~9V1atN~~ */		/** Exec : http://tpcg.io/rfVz8w */
	public class A{		public class A{
	/**		/**

Fukakai: /* Valid Code */

2019-08-23T20:50:48Z

Valid Code

← Older revision		Revision as of 22:50, 23 August 2019
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	===Valid Code===		===Valid Code===
	/**		/**
			* Exec: http://tpcg.io/9V1atN
	* This sample is compiling, OK		* This sample is compiling, OK
	**/		**/
Line 121:		Line 122:
	}		}
	}		}

	==SQL: Tests with Null==		==SQL: Tests with Null==
	create table sample(id int not null, name varchar);		create table sample(id int not null, name varchar);

Fukakai: /* Java: Equality Test - Strings & Integers */

2019-08-23T20:49:09Z

Java: Equality Test - Strings & Integers

← Older revision		Revision as of 22:49, 23 August 2019
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	=Standard Traps (in Java)=		=Standard Traps (in Java)=
	==Java: Equality Test - Strings & Integers==		==Java: Equality Test - Strings & Integers==
			/** Exec: http://tpcg.io/UxQq4J */
	public class EqualityTest{		public class EqualityTest{
	/**		/**

Fukakai: /* Invalid Code */

2019-08-23T20:43:37Z

Invalid Code

← Older revision		Revision as of 22:43, 23 August 2019
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	==Java: Inheritance Test ==		==Java: Inheritance Test ==
	===Invalid Code===		===Invalid Code===
			/** Exec : http://tpcg.io/9V1atN */
	public class A{		public class A{
	/**		/**
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	}		}
	class B extends A{}		class B extends A{}

	===Valid Code===		===Valid Code===
	/**		/**

Fukakai: /* Standard Traps (in Java) */

2019-08-23T20:23:56Z

Standard Traps (in Java)

← Older revision		Revision as of 22:23, 23 August 2019
Line 44:		Line 44:
	* Biometric datas		* Biometric datas
	=Standard Traps (in Java)=		=Standard Traps (in Java)=
	==Equality Test - Strings & Integers==		==Java: Equality Test - Strings & Integers==
	public class EqualityTest{		public class EqualityTest{
	/**		/**
Line 90:		Line 90:
	}		}

	==Inheritance Test ==		==Java: Inheritance Test ==
	===Invalid Code===		===Invalid Code===
	public class A{		public class A{
Line 118:		Line 118:
	}		}
	}		}
			==SQL: Tests with Null==
			create table sample(id int not null, name varchar);

			insert into sample values(0, "Clark");
			insert into sample values(1, "Lois");
			insert into sample values(2, "");
			insert into sample values(3, "Bruce");
			insert into sample values(4, NULL);
			insert into sample values(5, "Tony");
			insert into sample values(6, "Howlett");
			insert into sample values(7, "Peter");

			select * from sample where name is null; /* 2 Lines returned - id 2 and 4 */
			select * from sample where name = ""; /* 1 Line returned - id 2 */
			select * from sample where name = null; /* 0 Lines returned */

Fukakai: /* Equality Test - Strings & Integers */

2019-08-23T20:14:40Z

Equality Test - Strings & Integers

← Older revision		Revision as of 22:14, 23 August 2019
Line 44:		Line 44:
	* Biometric datas		* Biometric datas
	=Standard Traps (in Java)=		=Standard Traps (in Java)=
	===Equality Test - Strings & Integers ===		==Equality Test - Strings & Integers==
	public class EqualityTest{		public class EqualityTest{
	/**		/**
Line 89:		Line 89:
	}		}
	}		}

	==Inheritance Test ==		==Inheritance Test ==
	===Invalid Code===		===Invalid Code===

Fukakai: /* Inheritance Test */

2019-08-23T20:14:01Z

Inheritance Test

← Older revision		Revision as of 22:14, 23 August 2019
Line 89:		Line 89:
	}		}
	}		}
	===Inheritance Test ===		==Inheritance Test ==
	====Invalid Code====		===Invalid Code===
	public class A{		public class A{
	/**		/**
Line 100:		Line 100:
	}		}
	class B extends A{}		class B extends A{}
	====Valid Code====		===Valid Code===
	/**		/**
	* This sample is compiling, OK		* This sample is compiling, OK