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算单价的java代码 java计算打折扣

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关于JAVA的问题，已知苹果单价 ， 输入重量 求总价，乘法怎么插入 。求高手指点 ， 我是初学public void actionPerformed(ActionEvent e)
{
output.setText(input.getText());
}
将上述代码改成算单价的java代码：
public void actionPerformed(ActionEvent e)
{
String sw=input.getText(); //获取输入重量
if(!sw.trim().equals("")){//判断重量文本框中算单价的java代码的内容不为空时才执行if语句
double w=Double.parseDouble(sw);//将重量字符串转换成double型
double price=w*6;//将重量*单价 得到总价
output.setText(price+"元");//在输出文本框中输入
}
}
另外算单价的java代码 ， 再将代码中的 btn=new Button("清零");改成 btn=new Button("计算"); 界面会更合理一点
java超市计价系统代码package entity;
public class Market {
private int id;//id
private int num;//数量
private String goods;//商品
private double price;//价格

public Market(int id, int num, String goods, double price) {
super();
this.id = id;
this.num = num;
this.goods = goods;
this.price = price;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
public String getGoods() {
return goods;
}
public void setGoods(String goods) {
this.goods = goods;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public double calc( ){
double sum=price*num;
System.out.println("您消费共计："+sum+"￥");
return sum;
}
}
package test;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import entity.Market;
public class Test {
private static MapInteger,Market goods=new HashMapInteger, Market();
public static void main(String[] args) {
System.out.println("-------超市计价系统-------");
String goods1="可口可乐";
String goods2="爆米花";
String goods3="益达";
printTable("编号","商品","价格");
printTable("1",goods1,"3.0￥");
printTable("2",goods2,"5.0￥");
printTable("3",goods3,"10.0￥");
goods.put(1, new Market(1, 1, goods1, 3.0));
goods.put(2, new Market(2, 1,goods2, 5.0));
goods.put(3, new Market(3, 1, goods3, 10.0));
Scanner input = new Scanner(System.in);
System.out.println("请输入商品的编号:");
int num = input.nextInt();
System.out.println("请输入商品的数量");
int amount = input.nextInt();
Market market = goods.get(num);
market.setNum(amount);
market.calc();
}
private static void printTable(String row1,String row2,String row3 ) {
System.out.print(row1);
int times=12;
if (row2!="商品") {
times=5;
}
for (int i = 0; itimes; i++) {
System.out.print(" ");
}
System.out.print(row2);
for (int i = 0; i10; i++) {
System.out.print(" ");
}
System.out.print(row3);
System.out.println("\n");
}
}
//测试结果：
-------超市计价系统-------
编号商品价格
1可口可乐3.0￥
2爆米花5.0￥
3益达10.0￥
请输入商品的编号:
3
请输入商品的数量
5
您消费共计：50.0￥
用Java编写输入某一商品名称,查询其单价和数量import java.util.Scanner;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

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