[英]String Value to set an Enum
I would like to set an enum type by using one of its values as an input:我想通过使用枚举类型之一作为输入来设置枚举类型:
This is the code i'm using,这是我正在使用的代码,
package models;
import models.crudsiena.SienaSupport;
import siena.*;
public class Item extends SienaSupport {
@Id
public Long id;
public static enum Type{
A,
B
};
public Type itemType;
public Item(String itemType) {
this.itemType = Type.valueOf(itemType);
}
}
When I try to use new Item("A")
it returns me a NullPointerException occured: Name is null
当我尝试使用new Item("A")
它返回给我一个NullPointerException occured: Name is null
Try this:尝试这个:
public Item(String itemType) {
if (itemType == null) {
throw new IllegalArgumentException("null itemType");
}
this.itemType = Type.valueOf(itemType);
}
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