How to write if multiple conditions in java

There are two ways to write if statements containing multiple conditions in Java: if-else statement chains or Boolean logical operators. If-else statement chains check conditions one by one through nested if-else statements, and Boolean logical operators (such as &&, ||) can combine conditions together.

Writing multiple conditional if statements in Java

In Java, you can useif- else statement chains or Boolean logical operators to write if statements containing multiple conditions.

if-else statement chain

This method checks each condition through a series of nested if-else statements:

<code class="java">if (condition1) {
  // 条件 1 成立时执行的代码
} else if (condition2) {
  // 条件 2 成立时执行的代码
} else if (condition3) {
  // 条件 3 成立时执行的代码
} else {
  // 没有任何条件成立时执行的代码
}</code>

Boolean logic operators

&& (AND operator) and || (OR operator) and other Boolean logic Operators can be used to combine conditions:

<code class="java">if (condition1 && condition2) {
  // 只有条件 1 和条件 2 都成立时执行的代码
}

if (condition1 || condition2) {
  // 条件 1 或条件 2 任何一个成立时执行的代码
}</code>

Example

Suppose we need to check if a student's grade is higher than a passing mark.

<code class="java">int grade = 75;

if (grade >= 60) {
  System.out.println("及格");
} else {
  System.out.println("不及格");
}</code>

This code uses a if-else chain of statements to check if the grade is greater than or equal to 60.

Note

• Nested if-else Chains of statements can become complex and difficult to understand.
• When using Boolean logical operators, pay attention to the priority of the operator.

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