在父类的arraylist中区分每个子类

ArrayList<ParentClass> list = new ArrayList<>();
list.add(new ChildClass1());
list.add(new ChildClass2());

for (ParentClass obj : list) {
    if (obj instanceof ChildClass1) {
        ChildClass1 child1 = (ChildClass1) obj;
        // 处理ChildClass1对象
    } else if (obj instanceof ChildClass2) {
        ChildClass2 child2 = (ChildClass2) obj;
        // 处理ChildClass2对象
    }
}

class ParentClass {
    protected String type;

    public String getType() {
        return type;
    }
}

class ChildClass1 extends ParentClass {
    public ChildClass1() {
        type = "ChildClass1";
    }
}

class ChildClass2 extends ParentClass {
    public ChildClass2() {
        type = "ChildClass2";
    }
}

ArrayList<ParentClass> list = new ArrayList<>();
list.add(new ChildClass1());
list.add(new ChildClass2());

for (ParentClass obj : list) {
    if (obj.getType().equals("ChildClass1")) {
        // 处理ChildClass1对象
    } else if (obj.getType().equals("ChildClass2")) {
        // 处理ChildClass2对象
    }
}

enum ChildType {
    CHILD_CLASS_1,
    CHILD_CLASS_2
}

class ParentClass {
    protected ChildType type;

    public ChildType getType() {
        return type;
    }
}

class ChildClass1 extends ParentClass {
    public ChildClass1() {
        type = ChildType.CHILD_CLASS_1;
    }
}

class ChildClass2 extends ParentClass {
    public ChildClass2() {
        type = ChildType.CHILD_CLASS_2;
    }
}

ArrayList<ParentClass> list = new ArrayList<>();
list.add(new ChildClass1());
list.add(new ChildClass2());

for (ParentClass obj : list) {
    if (obj.getType() == ChildType.CHILD_CLASS_1) {
        // 处理ChildClass1对象
    } else if (obj.getType() == ChildType.CHILD_CLASS_2) {
        // 处理ChildClass2对象
    }
}