我面临以下代码:
public class BaseGroup {
private Group1 group1;
private Group2 group2;
private Group3 group3;
public void setGroup (IGroup group) {
if(group instanceof Group1) {
setGroup1((Group1) group);
} else if(group instanceof Group2) {
setGroup2((Group2) group);
} else {
setGroup3((Group3) group);
}
}
public Group1 getGroup1() {
return group1;
}
public void setGroup1(Group1 group1) {
this.group1 = group1;
}
public Group2 getGroup2() {
return group2;
}
public void setGroup2(Group2 group1) {
this.group2 = group2;
}
public Group3 getGroup3() {
return group3;
}
public void setGroup3(Group3 group1) {
this.group3 = group3;
}
}
而BaseGroup类就是这样使用的。
BaseGroup baseGroup = New BaseGroup();
basegroup.setGroup(group);
我的问题是这个“instanceof”链调用各自的 setter 来组装 BaseGroup 对象。执行此操作的更好方法是什么?
最佳答案
你可以添加一个方法到
interface IGroup {
public void addToGroup(BaseGroup bg);
}
class Group1 implements IGroup {
public void addToGroup(BaseGroup bg) { bg.setGroup1(this); }
}
// etc for Group2 and 3.
IGroup group;
BaseGroup bg;
group.addToGroup(bg);
关于java - Chain of "instanceof' s”组装一个对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8243345/