java中继承的语法格式是怎样的

java中继承的语法格式如下：
public class A
{}
public class B extends A
{}
extends就表示继承,extends后面是的父类

//父类 Shape类的声明
abstract class Shape
{
public final double PI = 3.141592654;
protected Color color; //颜色
protected int lineSize; //线宽
public Shape() //构造函数1
{
color = Color.black;
lineSize = 1;
}
public Shape(Color c, int ls) //构造函数2
{
color = c;
lineSize = ls;
}
//设置颜色方法
public void setColor(Color c)
{
color = c;
}
//获得颜色方法
public Color getColor()
{
return color;
}
//设置线宽方法
public void setLineSize(int ls)
{
lineSize = ls;
}
//获得线宽方法
public int getLineSize()
{
return lineSize;
}