What does if mean in java

The if statement is the basic control flow structure in Java that executes or skips a code block based on given conditions. The syntax is if (boolean_expression) { // code block }. It can be nested in another if statement to form a nested if statement to implement complex code logic.

The meaning of if statement in Java

The if statement is one of the basic control flow structures in Java. Used to execute or skip blocks of code based on given conditions.

How it works

The if statement works as follows:

• It starts with the if keyword, followed by an Boolean expression.
• If the Boolean expression evaluates to true, the block of code within the parentheses is executed.
• If the Boolean expression evaluates to false, skip the code block and continue executing the following code.

Grammar

The general syntax of the if statement is as follows:

<code class="java">if (boolean_expression) {
    // 代码块
}</code>

Among them, boolean_expression is one that will return true or a Boolean expression with a false value.

Nested If Statements

An if statement can be nested within another if statement, forming a structure called a nested if statement. This allows complex code logic to be executed based on multiple conditions.

<code class="java">if (condition1) {
    if (condition2) {
        // 代码块
    }
}</code>

Example

The following is a Java code example illustrating the use of if statement:

<code class="java">int age = 20;

if (age >= 18) {
    System.out.println("成年");
} else {
    System.out.println("未成年");
}</code>

In this example, the if statement checksage Whether the value of the variable is greater than or equal to 18. If so, print "Adult", otherwise print "Minor".

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