java1.7已经支持了匹配字符串
方案1.
enum Animal {
dog,cat,bear;
public static Animal getAnimal(String animal){
return valueOf(animal );
}
}
public class Client {
public void caseAnimal(String animal){
switch(Animal.getAnimal(animal)){
case cat:
System.out.println("this is a cat");
break;
case dog:
System.out.println("this is a dog");
break;
case bear:
System.out.println("this is a bear");
break;
}
}
public static void main(String[] args) {
Client client = new Client();
client.caseAnimal("cat");
}
}
方案2
enum Seasons{
SPRING,SUMMER,AUTUMN,WINTER
}
public class TestMultiInterface{
public static void main(String[] args){
Seasons str=Seasons.SPRING;
switch(str.ordinal()){
case 0:
System.out.println(str.toString());
break;
case 1:
System.out.println(str.toString());
break;
default:
System.out.println("没找到");
}
}
}
方案3
public void switchCase() {
Map<String,Integer> map=new HashMap<String, Integer>();
map.put("中国", 1);
map.put("美国", 2);
map.put("英国", 3);
map.put("法国", 4);
String str="中国";
switch(map.get(str))
{
case 1:
System.out.println("中国");
break;
case 2:
System.out.println("美国");
break;
case 3:
System.out.println("英国");
break;
case 4:
System.out.println("法国");
break;
default:
System.out.println("default");
}
}
方案4
String str1 = "aa";
String[] str2 = {"bb", "aa", "cc", "aaa"};
for (int i = 0; i < str2.length; ++i){
switch (str1.compareTo(str2[i])) {
case 0: System.out.println("OK");
break;
default: System.out.println("Error");
break;
}
}
方案5
public class Client {
public Client(String animal) {
//使用String的hasCode取得字符串的哈希码，此方法要保证哈希码不重复
switch (animal.hashCode()) {
case 98262:
System.out.println("this is a cat");
break;
case 99644:
System.out.println("this is a dog");
break;
case 3019700:
System.out.println("this is a bear");
break;
}
}
public static void main(String[] args) {
Client client = new Client("bear");
}
方案6 如果是在使用简单工厂设计模式，可以考虑利用java反射技术代替switch
public static UserDao createUser(){
Animal animal=null;
try {
iu=(Animal) Class.forName(Animal接口下子类的完整类名).newInstance();
}catch (Exception e) {
e.printStackTrace();
}
return animal;
}
以上方案，有的是从网上收集来的，有的是自己原创的，因为时间过长，已经不记得从哪个地方摘抄下来的，没有注明转载的地方，十分抱歉！