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191 Lessons1. Introduction to Java
2. What is Java?
3. History of Java
4. Java Tutorial for Beginners
5. How Do Java Programs Work?
6. JDK in Java
7. C++ Vs Java
8. Java vs. Python
9. Java vs. JavaScript
10. From Java Source Code to Executable
11. How to Install Java in Linux
12. How to Install Java in Windows 10
13. Java Hello World Program
14. Structure of Java Program and Java Syntax
15. Operators in Java
16. Java If-else
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17. Switch Case In Java
18. Loops in Java
19. Infinite loop in Java
20. For Loop in Java
21. For Each Loop in Java
22. Constructor in Java
23. Constructor Overloading in Java
24. Copy Constructor in Java
25. Default Constructor in Java
26. Parameterized Constructors in Java
27. Constructor Chaining In Java
28. Finalize Method in Java
29. Static Method in Java
30. Equals Method in Java
31. Abstract Method in Java
32. toString() Method in Java
33. Difference between equals method in Java
34. Inheritance in Java
35. Multiple Inheritance in Java
36. Hierarchical Inheritance in Java
37. Java Classes and Objects
38. Scanner Class in java
39. All classes in java are inherited from which class
40. What is Nested Class in Java
41. POJO Class in Java
42. Anonymous Class in Java
43. Final Class in Java
44. Object Class in Java
45. Packages in Java
46. Access Modifiers in Java
47. Static Keyword In Java
48. Final Keyword in Java
49. Checked and Unchecked Exceptions in Java
50. User Defined Exception in Java
51. Error vs. Exception in Java
52. Java Collection
53. Collections in Java
54. Garbage Collection in Java
55. Generics In Java
56. Java Interfaces
57. Functional Interface in Java
58. Marker Interface in Java
59. Streams in Java
60. Byte stream in java
61. File Handling in Java
62. Thread in Java
63. Thread Lifecycle In Java
64. Daemon Thread in Java
65. Thread Priority in Java
66. Deadlock in Java
67. String Pool in Java
68. Java Database Connectivity(JDBC)
69. Design Patterns in Java
70. Functional Programming in Java
71. OOP vs Functional vs Procedural
72. Heap Memory and Stack Memory in Java
73. Applet in Java
74. Java Swing
75. Java Frameworks
76. Hibernate Framework
77. JUnit Testing
78. How to Install Eclipse IDE for Java?
79. Command line arguments in Java
80. Jar file in Java
81. Java Clean Code
82. OOPs Concepts in Java
83. Java OOPs Concepts
84. Overloading vs Overriding in Java
85. Java 8 features
86. String in Java
87. String to int in Java
88. Why String Is Immutable in Java?
89. Primitive Data Types in Java
90. Non-Primitive Data Types in Java
91. This and Super Keyword in Java
92. HashMap in Java
93. Comparable And Comparator in Java
94. Type Casting in Java
95. Arrays Sort in Java with Examples
96. Variable Hiding and Variable Shadowing in Java
97. Enum in Java
98. Substring in Java
99. Pattern Programs in Java
100. Hashcode in Java
101. What is ByteCode in Java?
102. How To Take Input From User in Java
103. GCD of Two Numbers in Java
104. Linked List in Java
105. Arithmetic Operators in Java
106. Conditional Operators in Java
107. Stack and Queue in Java
108. Array Length in Java
109. Number Pattern Program in Java
110. Split in java
111. Map In Java
112. Difference Between Throw and Throws in Java
113. Difference Between Data Hiding and Abstraction
114. HashSet in Java
115. String Length in Java
116. Factorial Using Recursion in Java
117. DateFormat in Java
118. StringBuilder Class in java
119. Instance variables in Java
120. Java List Size
121. Java APIs
122. Reverse an Array in Java
123. StringBuffer and StringBuilder Difference in Java
124. Java Program to Add Two Numbers
125. String to Array in Java
126. Regular Expressions in Java
127. Identifiers in Java
128. Data Structures in Java
129. Set in Java
130. Pass By Value and Call By Reference in Java
131. Try Catch in Java
132. Bubble Sort in Java
133. Caesar Cipher Program in Java
134. Queue in Java
135. Object Creation in Java
136. Multidimensional Array in Java
137. How to Read a File in Java
138. String Comparison in Java
139. Volatile Keyword in Java
140. Control Statements in Java
141. Jagged Array in Java
142. Two-Dimensional Array in Java
143. Java String Format
144. Replace in Java
145. charAt() in Java
146. CompareTo in Java
147. Matrix Multiplication in Java
148. Static Variable in Java
149. Event Handling in Java
150. parseInt in Java
151. Java ArrayList forEach
152. Abstraction in Java
153. String Input in Java
154. Logical Operators in Java
155. instanceof in Java
156. Math Floor in Java
157. Selection Sort Java
158. int to char in Java
159. Stringtokenizer in java
160. Implementing and Manipulating Abs in Java
161. Char array to string in java
162. Convert Double To String In Java
163. Deque in Java
164. Converting a List to an Array in Java
165. The Max function in java
166. Removing whitespace from string in java
167. String arrays in Java
168. Strings in Java Vs Strings in Cpp
169. Sum of digits of a number in Java
170. Art of Graphical User Interfaces
171. Trim in Java
172. RxJava
173. Recursion in Java
174. HashSet Java
175. Difference Between Java and Python
176. Square Root in Java
177. Reverse A String in Java
178. Even Odd Program in Java
179. Fibonacci Series in Java
180. Prime Number Program in Java
181. Java Program to Print Prime Numbers in a Given Range
182. Java Leap Year Program
183. Swapping of Two Numbers in Java
184. LCM of Two Numbers in Java
185. Math.sqrt() Function in Java
186. Area of Triangle in Java
187. Sort a String In Java
188. Factorial Program in Java
189. Javafx
190. Lambda expression in java
191. Setup Java Home and IDE on macOS
In Java programming, the If else in java plays a crucial role in making decisions and controlling the flow of the program. By understanding and mastering this construct, developers can create more robust and efficient code. This comprehensive guide will walk you through the various aspects of if-else statements in Java, providing clear explanations, real-life examples, and practical exercises to enhance your understanding. Whether you are a beginner or an experienced programmer, this guide will help you become proficient in using if-else statements to make effective decisions in your Java programs.
Before diving into the details, let's have a brief overview of what if-else statements in Java are all about. An if-else statement allows a program to make decisions based on certain conditions. It evaluates a condition, and if it is true, it executes a block of code. Otherwise, if the condition is false, it executes an alternate block of code specified by the "else" clause.
In Java, if statements can be used with strings to perform different actions based on different string values. This allows you to create conditional logic through the conditional statement in java that depends on the content of strings. In this section, we will explore how to use if statements with strings and provide real-life examples to demonstrate their practical applications.
To compare strings in Java, you should use the equals() method or the equalsIgnoreCase() method. The equals() method compares two strings for exact equality, while the equalsIgnoreCase() method compares strings while ignoring differences in case. These methods return a boolean value indicating whether the strings are equal or not.
The syntax of using if statements with strings in Java is as follows:
Example: Checking User Input
Let's consider an example where we ask the user to enter a color, and based on the input, we perform different actions using if statements.
If the input is "red," "blue," or "green," the corresponding messages are printed.
The "if" statement in Java is a fundamental construct that allows you to execute a block of code when a specified condition is true. It forms the foundation of decision-making in programming and plays a vital role in controlling the flow of your Java programs. Understanding the syntax and effective usage of if statements is crucial for writing robust and efficient code.
Syntax of the If Statement:
if (condition) {
// Code to be executed if the condition is true
}
If statement in java example
Let's consider a practical example where we prompt the user to enter a number, and based on the input, we display a message. If the number is positive, we print "The number is positive." Otherwise, if the number is negative, we print "The number is negative."
The output depends on the input of the user. For instance:
1. When the user enters a positive number:
2. When the user enters a negative number:
The if-else statement in Java, also known as the if-then-else statement, extends the basic if statement by providing an alternative block of code to execute when the condition evaluates to false. This construct allows you to handle multiple possible outcomes based on different conditions. In this section, we will explain the syntax and usage of the if-else statement with examples.
Syntax of the if-else Statement:
The syntax of the if-else statement in Java is as follows:
The condition in the if statement should be a boolean expression that evaluates to either true or false. If the condition is true, the code block within the if block is executed. If the condition is false, the code block within the else block is executed.
Example: Checking if a Number is Even or Odd
Let's consider an example where we want to determine if a given number is even or odd using the if-else statement.
If the condition is false, meaning the remainder is not 0, the code within the else block is executed, and the message "The number is odd." is printed.
When a program encounters an if-else statement in Java, it follows a specific evaluation process to determine which block of code to execute. This evaluation process consists of the following steps:
It is important to note that only one block of code is executed in an if-else statement. If the condition in the if statement evaluates to true, the code block associated with that if statement is executed, and the rest of the if-else statement is skipped. Similarly, if an else-if condition evaluates to true, only the code block associated with that particular else-if statement is executed, and the rest of the if-else statement is skipped.
If-else statements allow for multiple branching paths in the code execution, enabling the program to make decisions based on different conditions. This control flow structure is fundamental to writing flexible and dynamic programs.
Example:
Let's consider an example to demonstrate the working of if-else statements:
Output:
Nested if statements in Java allow you to have if statements within other if statements. This provides a way to handle complex decision-making scenarios where multiple conditions need to be evaluated. By nesting if statements, you can create a hierarchical structure for your code logic. Let's explore the syntax and usage of nested if statements with real-life examples.
Syntax of Nested If Statements:
The syntax of a nested if statement in Java is as follows:
In a nested if statement, an inner if statement is placed inside the code block of an outer if statement. The inner if statement is evaluated only if the condition of the outer if statement is true. This nesting can be continued further to handle more complex conditions.
Example: Checking Grade Status
Let's consider an example where we determine the grade status of a student based on their score and attendance. The student is considered to pass if the score is above 60 and the attendance is above 80%.
Output:
If both conditions are true, the program prints "Pass." If the score condition is true but the attendance condition is false, the program prints "Fail due to low attendance." If the score condition is false, the program prints "Fail due to low score."
Nested if statements provide a powerful way to handle complex decision-making scenarios by evaluating multiple conditions. By properly structuring your code and nesting if statements as needed, you can create logical and efficient code.
The if-else-if ladder statement in Java provides a way to test multiple conditions in sequence. It allows you to check for different conditions one by one and execute the corresponding block of code based on the first condition that evaluates to true. This construct is useful when you have multiple mutually exclusive conditions to evaluate. Let's explore the syntax and usage of the if-else-if ladder statement with examples.
Syntax of If-Else If Ladder Statement:
The syntax of the if-else-if ladder statement in Java is as follows:
In an if-else-if ladder statement, the conditions are evaluated in sequence from top to bottom. The code block associated with the first condition that evaluates to true is executed. If none of the conditions are true, the else block is executed (optional).
Example: Categorizing a Number
Let's consider an example where we categorize a given number into positive, negative, or zero.
If the number is greater than 0, it prints "Positive number." If the number is less than 0, it prints "Negative number." If the number is neither greater nor less than 0 (i.e., it is 0), it prints "Zero."
The if-else-if ladder statement provides a concise way to handle multiple conditions and perform different actions based on different scenarios. By structuring your code in an if-else-if ladder format, you can achieve clean and organized decision-making logic.
The ternary operator in Java provides a concise way to write if-else statements in a single line of code. It allows you to assign a value or perform an action based on a condition without using the traditional if-else syntax. Let's explore the syntax, advantages, and usage of the ternary operator with examples.
Syntax of Ternary Operator
The syntax of the ternary operator in Java is as follows:
In the ternary operator, the condition is evaluated. If the condition is true, the value assigned to the variable is value1. If the condition is false, the value assigned to the variable is value2.
Example: Assigning Maximum Value
Let's consider an example where we want to assign the maximum of two numbers to a variable using the ternary operator.
If num1 is greater than num2, the maximum value is assigned to the variable max as num1. Otherwise, the maximum value is assigned as num2. The value of max is then printed, which in this case is 20.
Use the following if-else statement java exercises to enhance your skills:
Output:
Example 2: Categorizing Temperature
In this example, the program categorizes the temperature into different levels: freezing, cold, moderate, or hot, based on specific temperature ranges.
Using if statements with strings in Java allows you to create conditional logic based on different string values. Whether you need to handle user input, perform authentication, or any other scenario where string comparison is required, the if statements with strings offer flexibility and control over program execution. By understanding the syntax and utilizing the appropriate string comparison methods, you can implement powerful and dynamic logic in your Java programs.
1. How do I choose between if-else statements and if-else-if ladder statements?
If-else statements are suitable when you have only two possible outcomes based on a condition. If-else-if ladder statements are useful when you have multiple conditions and need to test them in sequence, executing different code blocks based on the first matching condition.
2. How can I handle complex decision-making scenarios in Java?
Nested if statements provide a solution for handling complex decision-making scenarios. By placing if statements within other if statements, you can create a hierarchical structure to evaluate multiple conditions and execute corresponding code blocks.
3. How can I handle multiple conditions efficiently in Java?
The if-else-if ladder statement is a useful construct for handling multiple conditions efficiently. It allows you to test multiple conditions in sequence, executing the code block associated with the first condition that evaluates to true.
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upGrad does not grant credit; credits are granted, accepted or transferred at the sole discretion of the relevant educational institution offering the diploma or degree. We advise you to enquire further regarding the suitability of this program for your academic, professional requirements and job prospects before enr...