Java中&和&&以及|和||的区别、应用场景和代码示例

public class Main {
    public static void main(String[] args) {
        boolean a = true;
        boolean b = false;

        // 使用 &
        boolean result1 = a & checkCondition();
        // 输出: Result with &: false
        System.out.println("Result with &: " + result1); 

        // 使用 &&
        boolean result2 = a && checkCondition();
        // 输出: Result with &&: false
        System.out.println("Result with &&: " + result2); 

        // 使用 &，即使左边为 false，右边的表达式仍然会被计算
        boolean result3 = b & checkCondition();
        // 输出: Result with &: false
        System.out.println("Result with &: " + result3); 

        // 使用 &&，左边为 false 时，右边的表达式不会被计算
        boolean result4 = b && checkCondition();
        // 输出: Result with &&: false
        System.out.println("Result with &&: " + result4); 
    }

    public static boolean checkCondition() {
        System.out.println("Checking condition");
        return false;
    }
}

public class Main {
    public static void main(String[] args) {
        boolean a = true;
        boolean b = false;

        // 使用 |
        boolean result1 = a | checkCondition();
        // 输出: Result with |: true
        System.out.println("Result with |: " + result1); 

        // 使用 ||
        boolean result2 = a || checkCondition();
        // 输出: Result with ||: true
        System.out.println("Result with ||: " + result2); 

        // 使用 |，即使左边为 true，右边的表达式仍然会被计算
        boolean result3 = b | checkCondition();
        // 输出: Result with |: false
        System.out.println("Result with |: " + result3); 

        // 使用 ||，左边为 true 时，右边的表达式不会被计算
        boolean result4 = b || checkCondition();
        // 输出: Result with ||: true
        System.out.println("Result with ||: " + result4); 
    }

    public static boolean checkCondition() {
        System.out.println("Checking condition");
        return false;
    }
}

public class Main {
    public static void main(String[] args) {
        // 记录日志
        boolean condition1 = checkCondition1();
        boolean condition2 = checkCondition2();
        boolean result1 = condition1 & condition2;
        System.out.println("Final result: " + result1);

        // 更新多个状态
        boolean status1 = updateStatus1();
        boolean status2 = updateStatus2();
        boolean result2 = status1 & status2;
        System.out.println("Final result: " + result2);

        // 多个副作用操作
        boolean operation1 = performOperation1();
        boolean operation2 = performOperation2();
        boolean result3 = operation1 & operation2;
        System.out.println("Final result: " + result3);

        // 多个输入验证
        boolean isValid1 = validateInput1();
        boolean isValid2 = validateInput2();
        boolean result4 = isValid1 & isValid2;
        System.out.println("Final result: " + result4);
    }

    public static boolean checkCondition1() {
        System.out.println("Checking condition 1");
        return true;
    }

    public static boolean checkCondition2() {
        System.out.println("Checking condition 2");
        return false;
    }

    public static boolean updateStatus1() {
        System.out.println("Updating status 1");
        return true;
    }

    public static boolean updateStatus2() {
        System.out.println("Updating status 2");
        return false;
    }

    public static boolean performOperation1() {
        System.out.println("Performing operation 1");
        return true;
    }

    public static boolean performOperation2() {
        System.out.println("Performing operation 2");
        return false;
    }

    public static boolean validateInput1() {
        System.out.println("Validating input 1");
        return true;
    }

    public static boolean validateInput2() {
        System.out.println("Validating input 2");
        return false;
    }
}