我遇到此错误的问题,同时试图编写一个方法,列出特定类中的所有名称。 (在底部的错误)我已经尝试了一些事情,但对于我的生活,无法弄清楚。请帮忙,谢谢。问题与“非静态方法不能从静态上下文引用”错误
类猫:
public class Cat
{
// instance variables
private String name;
private int yearOfBirth;
private int weightInKilos;
public Cat() {
setName("");
setYearOfBirth(0);
setWeightInKilos(0);
}
/**
*
*/
public Cat(String newName, int newYearOfBirth, int newWieghtInKilos)
{
setName(newName);
setYearOfBirth(newYearOfBirth);
setWeightInKilos(newWieghtInKilos);
}
public String getName(){
return name;
}
public int getYearOfBirth(){
return yearOfBirth;
}
public int getWieghtInKilos(){
return weightInKilos;
}
public void setName(String newName){
if (newName != null){
name = newName;
}
else{
System.out.println("Invalid Name");
}
}
public void setYearOfBirth(int newYearOfBirth){
if (yearOfBirth >= 0){
yearOfBirth = newYearOfBirth;
}
else{
System.out.println("Year Of Birth must not be negative!");
}
}
public void setWeightInKilos(int newWeightInKilos){
if (weightInKilos >= 0){
weightInKilos = newWeightInKilos;
}
else{
System.out.println("Weight must not be negative!");
}
}
}
类猫舍:
import java.util.ArrayList;
public class Cattery
{
// instance variables - replace the example below with your own
private ArrayList <Cat> cats;
private String businessName;
/**
* Constructor for objects of class Cattery
*/
public Cattery(String NewBusinessName)
{
cats = new ArrayList <Cat>();
NewBusinessName = businessName;
}
public void addCat(Cat newCat){
cats.add(newCat);
}
public void indexDisplay(int index) {
if((index >= 0) && (index <= cats.size()-1)) {
System.out.println(index);
}
else{
System.out.println("Invalid index position!");
}
}
public void removeCat(int indexremove){
if((indexremove >= 0) && (indexremove <= cats.size()-1)) {
cats.remove(indexremove);
}
else{
System.out.println("Invalid index position!");
}
}
public void displayNames(){
System.out.println("The current guests in Puss in Boots Cattery:");
for(Cat catNames : cats){
System.out.println(Cat.getName()); //ERROR; non static method cannot be referenced from a static context..wtf
}
}
}
请帮帮忙,谢谢
谢谢你的工作,现在我明白了。我有另一个问题。我的公共无效indexDisplay不起作用。我希望它打印出我的其他类的名称,而不是打印出我设置的参数。我认为我需要让'索引'等于某件事,但我也遇到了麻烦。有什么建议么? – 2013-03-04 08:40:58
@JoshuaBaker:如果你有另一个问题,你应该问*作为另一个问题 - 理想情况下用一个简短但完整的程序*只显示问题。 – 2013-03-04 08:41:49