日继承：

继承：

 * Inheritance is implemented using the extends keyworrds.

 * Inheritance in java is a mechanism where one class child or subclass acquires the properties and behaviors fields and methods of another class parent or superclass.

 * subclass (child) - the class that inherits from another class

 * superclass (parent) - the class being inherited from To inherit from a class, use the extends keyword. # 

示例程序：

package reegan;
class Dad

{
int 钱=2000;
}
班级儿子延伸爸爸
{

}
公开课主课
{
public static void main(String []args)
{
儿子 s1=新儿子();
System.out.println(s1.money);
}
}

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