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Java if-else Statement

Barbara Streisand

Release： 2025-01-28 22:15:09

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Java condition statement detailed explanation: if, else, else if and nested if statement

This article will explore the conditional statements in Java, including if, else, else if and nesting if statements, and explain how to use them to control the program process. We will help you understand the working principles of these sentences and their application in actual programming through clear grammar examples and code examples.

Java uses the following conditional statements to execute different code blocks according to different conditions:

Sentence: if When the specified condition is true, execute the code block.
Sentence: When the conditions in the else statement are fake, execute the code block. if
Sentence:
When the previous or else if conditions are fake, test new conditions. if else if
(follow -up chapters will be explained in detail) to select one of multiple code blocks according to the value of the expression.
switch
Sentence

The statement is used to execute the code block according to the conditions. If the condition is true, execute the code block; otherwise, skip the code block. if grammar:

if

Note: must be a lowercase. Capital (if or IF) can cause errors.

<code class="language-java">if (condition) {
  // 条件为真时执行的代码块
}</code>

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Example:

Java if-else Statement

Output: if 20 greater than 18

Sentence

<code class="language-java">if (20 > 18) {
  System.out.println("20 大于 18");
}</code>

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The statements are used with

statements. When the conditions in the statement are the code block when fake.

grammar:

Example: else

Output: else if if Good every.

Sentence

<code class="language-java">if (condition) {
  // 条件为真时执行的代码块
} else {
  // 条件为假时执行的代码块
}</code>

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The statement allows multiple conditions to test multiple conditions when the conditions are fake.

grammar:

<code class="language-java">int time = 20;
if (time < 18) {
  System.out.println("Good day.");
} else {
  System.out.println("Good evening.");
}</code>

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Example:

Output: else if Good every.

else if Stagenical sentence if

Stepses allow multiple conditions to test and perform only one of the codes corresponding to one of the conditions.

<code class="language-java">if (condition1) {
  // condition1 为真时执行的代码块
} else if (condition2) {
  // condition1 为假且 condition2 为真时执行的代码块
} else {
  // condition1 和 condition2 都为假时执行的代码块
}</code>

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nested

sentence Java if-else Statement

nested sentence refers to the other statement in the code block of one statement.

<code class="language-java">int time = 22;
if (time < 10) {
  System.out.println("Good morning.");
} else if (time < 18) {
  System.out.println("Good day.");
} else {
  System.out.println("Good evening.");
}</code>

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abbreviation (three yuan computing symbols) if...else

Tricile operator (? :) provides a more concise way to write

statements. if...else

grammar:

Example: variable = (condition) ? expressionTrue : expressionFalse;

Reference link:

<code class="language-java">if (condition) {
  // 条件为真时执行的代码块
}</code>

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W3Schools java conditional statement

javatpoint java if-ogse statement

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