How to use if statement in java

The if statement in Java is a conditional statement that executes or does not execute a block of code based on a given condition. The steps include: specifying conditions. If the condition is true, the code block is executed. Execute the code block.

The use of if statement in Java

The if statement is an important conditional statement in Java. It is based on Execute or not execute a block of code given a condition. Its syntax format is as follows:

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

Usage steps:

1. Specify conditions: Specify a Boolean expression as a condition in parentheses .
2. Judgment condition: Java will evaluate the given condition, and if the result is true, the code block will be executed; otherwise, the code block will be skipped.
3. Execute code block: If the condition is true, the statements contained in the code block are executed.

Example:

<code class="java">int age = 18;

if (age >= 18) {
  System.out.println("您已成年。");
}</code>

In this example, the value of the age variable is 18 and is consistent with the condition age &gt ;= 18 matches, so "You are of age." will be printed.

Other if statement types:

In addition to the basic if statement, Java also provides other types of if statements, including:

• if-else statement: Allows the code block to perform different operations based on different conditions.
• if-else-if statement: Allows a block of code to perform different actions based on multiple conditions.
• Nested if statements: Allows one if statement to contain another if statement.

Note:

• The condition must be a Boolean expression that evaluates to true or false.
• Code blocks can contain any number of statements, including other if statements. The
• if statement can use logical operators (&&, ||) to combine multiple conditions.

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