What are the java selectors?

Java selectors include: 1. switch statement; 2. if-else statement; 3. switch expression; 4. ternary operator. Detailed introduction: 1. switch statement, which is the most commonly used selector in Java, which allows different code blocks to be selected and executed based on the value of a variable; 2. if-else statement, which is another common selector. Used to execute different code blocks based on conditions; 3. Switch expression, this is a new feature introduced in Java 14, which allows switch statements and so on.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

The selectors in Java mainly include the following types:

1. Switch statement: This is the most commonly used selector in Java. It allows different code blocks to be selected for execution based on the value of a variable. For example:

switch (variable) {  
    case value1:  
        // 执行代码块1  
        break;  
    case value2:  
        // 执行代码块2  
        break;  
    default:  
        // 如果上面的case都不匹配，执行默认代码块  
}

2. if-else statement: This is another common selector used to execute different code blocks based on conditions. For example:

if (condition1) {  
    // 如果条件1为真，执行代码块1  
} else if (condition2) {  
    // 如果条件1为假，条件2为真，执行代码块2  
} else {  
    // 如果上面的条件都不满足，执行默认代码块  
}

3. Switch expression: This is a new feature introduced in Java 14, which allows expressions to be used in switch statements. For example:

int result = switch (variable) {  
    case value1 -> /* 返回结果1 */ 0;  
    case value2 -> /* 返回结果2 */ 1;  
    default -> /* 默认结果 */ -1;  
};

4. Ternary operator: This is a short selection structure used to select a value based on conditions. For example:

int result = (condition) ? value1 : value2;

The above are the main selectors in Java. They are very common in programming and are used to select and execute different blocks of code based on different conditions or values.

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