for(Color c:Color.values())? ? ? ? ? The great god to give pointers
Java Enum enumeration traversal to determine four ways (including Lambda expression filtering)
The following enumeration Color c : Color.values()does not understand this place too much.
Later, after reading these two articles, I understood
that obtaining the value in the color and then taking out the value in the for loop is equivalent to
Color[] cs = Color.values();
for (int i=0;i<=cs.length;i++) {
if(cs[i].getIndex()==index){
return cs[i].getName();
}
}
public static String getname(int index){
Color[] cs = Color.values();
for (int i=0;i<=cs.length;i++) {
//for (Color c : Color.values()) {
if(cs[i].getIndex()==index){
// if(c.getIndex()==index){
return cs[i].getName();
// return c.getName();
}
}
return "";
}
public enum Color
{
RED("s",1),GREEN("s",2),WHITE("s",3),YELLOW("s",4);
private Color(String name,int index)
{
this.name=name;
this.index=index;
}//是对应上面的组合
private String name;
private int index;
//构造方法
public int getIndex() {
return index;
}
public void setIndex(int index) {
this.index = index;
}
public String getName() {
return name;
}
public void setName(String Name) {
this.name = name;
}
public static String getname(int index){
Color[] cs = Color.values();
for (int i=0;i<=cs.length;i++) {
//for (Color c : Color.values()) {
if(cs[i].getIndex()==index){
// if(c.getIndex()==index){
return cs[i].getName();
// return c.getName();
}
}
return "";
}
}