package test; public class pp { private String name=""; private String addreass=""; public pp(String name2, String address) { // TODO Auto-generated constructor stub } public void pp (String name , String addreass) { this.name=name; this.addreass=addreass; } } public abstract class Employee extends pp{ private String ID=""; private double wage=0; private int age =0; public Employee(String name, String address, String ID, double wage, int age) { super(name, address); this.ID = ID; this.wage = wage; this.age = age; } public abstract void add (String position); } 帮我改错

在pp类中，您需要将构造函数的参数名称与类变量名称匹配。修改后的代码如下：

package test;

public class pp {

    private String name = "";
    private String address = "";

    public pp(String name, String address) {
        this.name = name;
        this.address = address;
    }

}

在Employee类中，您需要添加一个具体的构造函数来调用父类的构造函数。修改后的代码如下:

package test;

public abstract class Employee extends pp {

    private String ID = "";
    private double wage = 0;
    private int age = 0;

    public Employee(String name, String address, String ID, double wage, int age) {
        super(name, address);
        this.ID = ID;
        this.wage = wage;
        this.age = age;
    }

    public abstract void add(String position);

}

相关问题

java String packageName = intent.getDataString(); 怎么只取包名

您可以使用Java中的URI类和PackageManager类来获取包名。

您可以尝试以下代码：

Uri uri = Uri.parse(packageName);
String packageNameOnly = uri.getSchemeSpecificPart();
PackageManager packageManager = context.getPackageManager();
PackageInfo packageInfo = packageManager.getPackageInfo(packageNameOnly, 0);
String packageName = packageInfo.packageName;

这里，我们首先将intent.getDataString()返回的字符串转换为Uri对象，然后使用getSchemeSpecificPart()方法从Uri对象中提取包名。接着，我们使用PackageManager类通过包名获取PackageInfo对象，最后从PackageInfo对象中获取包名。

请注意，这段代码需要在try-catch块中执行，以处理可能的异常。

续写这段代码package animal; public abstract class Animal { private String name; public Animal(String name) { this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } public abstract void makeSound();

public class Cat extends Animal {
private int age;

public Cat(String name, int age) {
super(name);
this.age = age;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

@Override
public void makeSound() {
System.out.println("Meow");
}
}

public class Dog extends Animal {
private String breed;

public Dog(String name, String breed) {
super(name);
this.breed = breed;
}

public String getBreed() {
return breed;
}

public void setBreed(String breed) {
this.breed = breed;
}

@Override
public void makeSound() {
System.out.println("Woof");
}
}

public class Elephant extends Animal {
private int weight;

public Elephant(String name, int weight) {
super(name);
this.weight = weight;
}

public int getWeight() {
return weight;
}

public void setWeight(int weight) {
this.weight = weight;
}

@Override
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