在 if else 语句中同时使用多个条件

Question

我有一个涉及使用 Java 的 if else 语句的问题。我被困在如何在括号内放置两个条件，或者这是否可能？到目前为止，这是我的代码：public class rollerCoaster {    int age = 11;    int weight = 81;    if ( age <= 10 && weight < 10 ) {            System.out.println("This person needs to ride the black roller coaster.");    }    else if ( age <= 10 && weight >= 80 && <= 200  ) {    }    else {    }    //The new part is this:    else if ( condition_two ) {    }};

Answer 1

约定类名中的所有FIRTS图表的首字母都需要大写，而代码的结构我认为应该是这样的

public class RollerCoaster {

static int age = 11;

static int weight = 81;

public static void main(String args[]) {

    if(age <= 10) {

        if(weight < 10) {

            System.out.println("This person needs to ride the black roller coaster.");  

        }else if(weight >= 80 && weight <= 200) {

            System.out.println("This person needs to ride the red roller coaster.");

        }else {

            System.out.println("The roller coaster is not able for this person");

        }

    }else{

        if(weight < 10) {

            System.out.println("This person needs to ride the black roller coaster.");  

        }else if(weight >= 80 && weight <= 200) {

            System.out.println("This person needs to ride the red roller coaster.");

        }else {

            System.out.println("The roller coaster is not able for this person");

        }           

    }

}

}

Answer 2

对于关系运算符 '<=' 您需要提供两个操作数。所以你else if在你的 if 语句中应该是：

else if ( age <= 10 && weight >= 80 && weight <= 200 ) {
}