The difference between if and else if in java

The if and else if statements in Java are used to conditionally control the program flow. Their difference mainly lies in the execution order, condition type and execution: Execution order: if takes precedence, else if is checked subsequently. Condition type: if requires a Boolean value, else if can be any Boolean expression. Executability: If the condition is true, it will be executed, if it is false, it will be skipped; else if will only be checked when the if condition is false.

The difference between if and else if in Java

In Java, if and else if statements are used for control Program flow, which executes blocks of code based on specified conditions. The main difference between them is:

1. Execution sequence

• if: If the condition is true, the if block is executed code in .
• else if: If the condition of the if block is false, then the condition of the else if block is checked. If true, the code in the else if block is executed.

2. Condition

• #if: The condition of the if block must be a Boolean value (true or false).
• else if: else The condition of an if block can be any Boolean expression.

3. Executability

• if: If the condition is true, the code in the if block is executed. If the condition is false, the if block is skipped.
• else if: If the condition of the if block is false, then the condition of the else if block is checked. If true, the code in the else if block is executed. If false, continue checking the next else if block (if there is one).

4. else clause

• #if: can have an optional else clause, which is used in all The if and else if blocks are executed when both conditions are false.
• else if: There is no else clause.

Example

The following code snippet demonstrates the use of if and else if statements:

<code class="java">int age = 25;

if (age < 18) {
    System.out.println("未成年");
} else if (age >= 18 && age < 65) {
    System.out.println("成年");
} else {
    System.out.println("老年");
}</code>

In this example, if age If it is less than 18, "minor" will be printed. If age is greater than or equal to 18 but less than 65, print "adult". Otherwise, print "old".

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