JAVA的对象数组赋值，纠结了。。。52

发布网友发布时间：2023-11-22 09:08

共2个回答

热心网友时间：2024-12-03 17:05

楼上正解，我在这里给你另外一种赋值方式，供你参考。首先class DVD1中的代码生成get和set方法。然后通过实例化对象，去赋值，代码如下

public static void main(String[] args) {

DVD1[] manager = new DVD1[6];

//实例化一个对象
DVD1 dvd1 = new DVD1();
dvd1.setName("罗马假日");
dvd1.setDate("1日");
dvd1.setState("可借");
dvd1.setTimes(10);

manager[0] = dvd1; //给数据对象赋值

//实例化一个对象
DVD1 dvd2 = new DVD1();
dvd2.setName("java编程");
dvd2.setDate("null");
dvd2.setState("可借");
dvd2.setTimes(11);

manager[1] = dvd2; //给数据对象赋值

//实例化一个对象
DVD1 dvd3 = new DVD1();
dvd3.setName("面向对象");
dvd3.setDate("null");
dvd3.setState("可借");
dvd3.setTimes(1);

manager[2] = dvd3; //给数据对象赋值
｝

class DVD1{

String name;
String state;
String date;
int times;

public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public int getTimes() {
return times;
}
public void setTimes(int times) {
this.times = times;
}

}

追问不错不错，，，感谢感谢。。。

热心网友时间：2024-12-03 17:05

应为你没有对数组的元素初始化,new一下就行了

class OOP {
    public static void main(String[] args) {
        DVD1[] manager = new DVD1[6];

        for (int i = 0; i < manager.length; i++) {
            manager[i] = new DVD1();
        }

        manager[0].name = "罗马假日";
        manager[0].date = "1日";
        manager[0].state = "可借";
        manager[0].times = 10;

        manager[1].name = "java编程";
        manager[1].date = "null";
        manager[1].state = "可借";
        manager[1].times = 11;

        manager[2].name = "面向对象";
        manager[2].date = "null";
        manager[2].state = "可借";
        manager[2].times = 1;
    }
}

追问那我要他输入的显示出来，我用的是for循环，现在怎么值是
test1.DVD2@1aa9f99
test1.DVD2@d42d08
test1.DVD2@1d86fd3
这些玩意儿啊！！！搞不懂。。。。。拜托啦。。。

追答

这个是调用了Object里面的toStirng().默认的是

return getClass().getName() + "@" + Integer.toHexString(hashCode());

友好的显示,方法很多,我比价喜欢override toString();

class DVD1 {
    String name;
    String state;
    String date;
    int times;

    public String toString() {
        return "{" + name + "," + state + "," + date + "," + times + "}";
    }
}