Java是一種很強大的編程語言，它可以被用來實現各種各樣的應用程序，例如計算小費和消費率等。今天我們來看一看如何使用Java來計算小費和消費率。

public class TipAndTaxCalculator{
public static void main(String[] args){
double mealCost = 35.50;
double tipPercent = 0.15;
double taxPercent = 0.0675;
double tipAmount = mealCost * tipPercent;
double taxAmount = mealCost * taxPercent;
double totalCost = mealCost + tipAmount + taxAmount;
System.out.println("The cost of the meal is " + mealCost);
System.out.println("The tip is " + tipAmount);
System.out.println("The tax is " + taxAmount);
System.out.println("The total cost is " + totalCost);
}
}

代碼中聲明了三個double類型的變量，mealCost代表餐費，tipPercent代表小費占餐費的百分比，taxPercent代表稅率。接下來我們用mealCost、tipPercent和taxPercent這三個變量來計算小費、稅費和總費用。

我們把mealCost乘以tipPercent得到小費的數額，將mealCost乘以taxPercent得到稅費。最終的總費用是餐費、小費和稅費三者之和。

最后，我們使用System.out.println()方法將計算結果打印到屏幕上。