使用矢量来存储Fruit对象,每个对象都有名称、数量和价格。程序如下:import java.util.*;public class Gou{
Vector list;
Fruit f1=new Fruit();
Fruit f2=new Fruit();
Fruit f3=new Fruit(); f1.name="apple";f1.count=1;f1.price=3.5f;
f2.name="peer";f2.count=2;f2.price=4.5f;
f3.name="orange";f3.count=3;f3.price=5.5f;
public Gou(){
Vector<Fruit> list=new Vector<Fruit>();
list.add(f1);
list.add(f2);
list.add(f3);
for(Iterator it = list.iterator;it.hasNext;){
Fruit output = (Fruit)it.next();
System.out.println(output); }
}
}public class Fruit{
String name;
int count;
float price;
}
public static void main(String[] args){
Gou g = new Gou();
}问题:无法识别f1.name等期待您的回复。
Vector list;
Fruit f1=new Fruit();
Fruit f2=new Fruit();
Fruit f3=new Fruit(); f1.name="apple";f1.count=1;f1.price=3.5f;
f2.name="peer";f2.count=2;f2.price=4.5f;
f3.name="orange";f3.count=3;f3.price=5.5f;
public Gou(){
Vector<Fruit> list=new Vector<Fruit>();
list.add(f1);
list.add(f2);
list.add(f3);
for(Iterator it = list.iterator;it.hasNext;){
Fruit output = (Fruit)it.next();
System.out.println(output); }
}
}public class Fruit{
String name;
int count;
float price;
}
public static void main(String[] args){
Gou g = new Gou();
}问题:无法识别f1.name等期待您的回复。
import java.util.*;public class Gou {
Vector list;
Fruit f1 = new Fruit();
Fruit f2 = new Fruit();
Fruit f3 = new Fruit(); public Gou() {
Vector<Fruit> list = new Vector<Fruit>(); f1.setName("apple");
f1.setCount(1);
f1.setPrice(3.5f);
list.add(f1);
f2.setName("peer");
f2.setCount(2);
f2.setPrice(4.5f);
list.add(f2);
f3.setName("orange");
f3.setCount(3);
f3.setPrice(5.5f);
list.add(f3);
for (Iterator<Fruit> it = list.iterator(); it.hasNext();) {
Fruit output = (Fruit) it.next();
System.out.println(output);
}
} public static void main(String[] args) {
Gou g = new Gou();
}
}class Fruit {
private String name;
private int count;
private float price; public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getCount() {
return count;
} public void setCount(int count) {
this.count = count;
} public float getPrice() {
return price;
} public void setPrice(float price) {
this.price = price;
} /**
* 重写toString方法,方便打印
*/
@Override
public String toString() {
return name + ":" + count + ":" + price;
}
}帮你改了下,楼主可以看看!
public class Gou{
Vector list;
Fruit f1=new Fruit();
Fruit f2=new Fruit();
Fruit f3=new Fruit(); { //这段代码要么写在代码块里,要么写在方法里,直接写是不符合语法的
f1.name="apple";f1.count=1;f1.price=3.5f;
f2.name="peer";f2.count=2;f2.price=4.5f;
f3.name="orange";f3.count=3;f3.price=5.5f;
} public Gou(){
Vector<Fruit> list=new Vector<Fruit>();
//要么就把上面的代码写到这里
list.add(f1);
list.add(f2);
list.add(f3);
for(Iterator it = list.iterator;it.hasNext;){
Fruit output = (Fruit)it.next();
System.out.println(output);
}
}
}
f2.name="peer";f2.count=2;f2.price=4.5f;
f3.name="orange";f3.count=3;f3.price=5.5f;
---这一段写到方法里面去
import java.util.*;public class Gou{
Vector list;
Fruit f1=new Fruit();
Fruit f2=new Fruit();
Fruit f3=new Fruit();public Gou(){f1.name="apple";f1.count=1;f1.price=3.5f;
f2.name="peer";f2.count=2;f2.price=4.5f;
f3.name="orange";f3.count=3;f3.price=5.5f;
Vector<Fruit> list=new Vector<Fruit>();
list.add(f1);
list.add(f2);
list.add(f3);
for(Iterator it = list.iterator;it.hasNext;){
Fruit output = (Fruit)it.next();
System.out.println(output); }
}}public class Fruit{
String name;
int count;
float price;
}
public static void main(String[] args){
Gou g = new Gou();
}
Fruit output = (Fruit)it.next();
System.out.println(output); }
这一段也有问题
建议写成这个样子
for (Fruit output : list)
{
System.out.println(output.name + " " + output.count + " " + output.price); }