java - 如何在 Stock 类中进行用户定义输入

Question

我在程序中执行用户定义方法时遇到问题，如果有人能帮助我就好了

package Ex_9_2;



public class TestStock {
public static String price;

//main
public static void main(String[] args) {

    Stock stock = new Stock("ORCL", "Oracle Corporation");

    System.out.println("Please enter previous closing price ");
    stock.setPreviousClosingPrice(34.5);

    System.out.println("Please enter current price ");
    stock.setCurrentPrice(34.35);
    System.out.println(stock);

    // Display stock info
    System.out.println("Previous Closing Price: " + stock.getPreviousClosingPrice());
    System.out.println("Current Price: " + stock.getCurrentPrice());
    System.out.println("Price Change: " + stock.changePercent());
 }
}

这是我的另一个类

package Ex_9_2;

public class Stock {
private String symbol;
private String name;
private double previousClosingPrice;
private double currentPrice;

public Stock() {
}

public Stock(String symbol, String name) {
this.symbol = symbol;
this.name = name;
}

public String getSymbol() {
    return this.symbol;
}

public String getName() {
    return this.name;
}

public double getPreviousClosingPrice() {
    return previousClosingPrice;
}

public double getCurrentPrice() {
    return currentPrice;
}

public void setSymbol(String symbol) {
    this.symbol = symbol;
}

public void setName(String name) {
    this.name = name;
}

public void setPreviousClosingPrice(double price) {
      this.previousClosingPrice = price;
}

public void setCurrentPrice(double price) {
      this.currentPrice = price;
}

public double changePercent() {
    return (currentPrice - previousClosingPrice) / previousClosingPrice;
}

@Override
public java.lang.String toString(){
    return "\nYour Company's name is " + this.name
            + "\nYour Company's Symbol is " + this.symbol;

}

我似乎无法在我的主目录中针对此问题进行用户输入:

System.out.println("Please enter previous closing price ");
stock.setPreviousClosingPrice(34.5);

还有这个:

System.out.println("Please enter current price ");
stock.setCurrentPrice(34.35);

请帮忙，

Answer 1

您可以使用java.util.Scanner类来获取用户的输入。 在主函数中声明 Scanner 变量:

Scanner scan = new Scanner(System.in);

然后使用 scan.nexDouble() 获取用户的输入。例如:

System.out.println("Please enter previous closing price ");
stock.setPreviousClosingPrice(scan.nextDouble());