本文实例讲述了Java中父类和子类之间的转换操作。分享给大家供大家参考，具体如下：
package learn20180720;
public class People {
private String name;
private Integer age;
private Double height;
public People(){
this.name = "";
this.age = 0 ;
this.height = 0.0;
}
public People(String name, Integer age, Double height) {
super();
this.name = name;
this.age = age;
this.height = height;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Double getHeight() {
return height;
}
public void setHeight(Double height) {
this.height = height;
}
public void tellObjectName(People p) {
System.err.println(p.name);
}
public void sayInformation() {
System.err.println("我的名字叫做："+this.name+"我的年龄是："+this.age+"我的身高是"+this.height);
}
}
package learn20180720;
public class Chinese extends People{
private String country;
public Chinese(){
super();
country = "";
}
public Chinese(String aname,Integer aage,Double aheight) {
super(aname,aage,aheight);
this.country = "中国";
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public void sayInformation() {
// TODO Auto-generated method stub
System.err.println("我的名字叫做："+this.getName()+" 我的年龄是："+this.getAge()+" 我的身高是："+this.getHeight()+" 我的国家是："+this.country);
}
}
package learn20180720;
public class TestPeCh {
public static void main(String[] args) {
// TODO Auto-generated method stub
People p1 = new Chinese();
Chinese c1 = (Chinese)p1;
}
}
可以看到，p1无法访问子类中的特有的方法（父类引用可以访问子类中重写父类中的方法），但是强转成为子类类型的引用c1之后，c1就可以访问子类中所有的方法啦。
package learn20180720;
public class TestPeCh {
public static void main(String[] args) {
// TODO Auto-generated method stub
People p1 = new People();
Chinese c1 = (Chinese)p1;
}
}
报错了！
更多关于java相关内容感兴趣的读者可查看本站专题：《Java面向对象程序设计入门与进阶教程》、《Java数据结构与算法教程》、《Java操作DOM节点技巧总结》、《Java文件与目录操作技巧汇总》和《Java缓存操作技巧汇总》
希望本文所述对大家java程序设计有所帮助。
