創建含有一組用戶定義的最小值和最大值（JAVA）

Question

基本上之間的數字的ArrayList，我需要創建一個名爲方法：

public boolean doesContain(double x) 

其工作方式如下：

Returns true if and only if x lies between left and right, and the 
interval is not empty (i.e. left < right). 

這是類的樣子：

public class Interval { 

    private double left; 
    private double right; 

    public Interval(double left, double right){ 
     this.left = left; 
     this.right = right; 
    } 

    public boolean doesContain(double x){ 

     ArrayList<Double> nums = new ArrayList<Double>(); 
     //Add code here 

    } 
} 

Answer 1

public boolean doesContain(double x) { 
    if (left >= right) { 
     return false; 
    } else { 
     return x >= left && x <= right; 
    } 
} 

Answer 2

public boolean doesContain(double x){ 
    return left < right && left <= x && x <= right; 
}