关于#if-else#的问题，如何解决？

(编写if-else if语句(不是完整的程序，只是if-else语句)，将“temp”变量与面的值进行比较，并根据条件输出下面的语句。)
temp>=50："Take underground shelter and call for help"
temp>=40:"Stay Indoor and avoid hot activities"
temp>=30: “Drink lot of water "

if(temp>=50){
    System.out.println("Take underground shelter and call for help");
}else if (temp>=40){
    System.out.println("Stay Indoor and avoid hot activities");
}elseif (temp>=30){
    System.out.println("Drink lot of water");
}



if(temp>=50) {
    System.out.println("Take underground shelter and call for help");
}else if(temp>=40) {
    System.out.println("Stay Indoor and avoid hot activities");
}else if(temp>=30) {
    System.out.println("Drink lot of water");
}


        if(temp >= 50) {
            System.out.println("Take underground shelter and call for help");
        } else if(temp >= 40) {
            System.out.println("Stay Indoor and avoid hot activities");
        } else if(temp >= 30) {
            System.out.print("Drink lot of water");
        }

if(temp >= 30 && temp < 40){
System.out.println("Take underground shelter and call for help");
}else if(temp >= 40 && temp < 50){
System.out.println("Stay Indoor and avoid hot activities");
}else if(temp >= 50){
System.out.println("Take underground shelter and call for help");
}else{
System.out.println("invalid num");
}
有帮助的话请采纳～～

可以从输入获取一个int值赋值给temp变量，也可以直接给它赋值，然后使用if-else语句来根据不同的条件打印不同的语句即可，一个实现如下：

import java.util.Scanner;

public class TempTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc = new Scanner(System.in);
        int temp  = sc.nextInt();// 获取一个int值，赋值给temp
        
        // 根据temp的不同值，打印不同的提示语句
        if(temp>=50) {
            System.out.println("Take underground shelter and call for help");
        }else if(temp>=40) {
            System.out.println("Stay Indoor and avoid hot activities");
        }else if(temp>=30) {
            System.out.println("Drink lot of water");
        }
                
            
                    
                
    }

}

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