谢谢大家了!!
class Table{
int weight,wide,length,high,area;
char name;
Table(char x,int y,int z,int l,int m)
{name=x;
length=y;
wide=z;
high=l;
weight=m;
}
void area()
{area=length*wide;}
void display()
{
System.out.println("name is"+name);
System.out.println("length is"+length);
System.out.println("wide is"+wide);
System.out.println("high is"+high);
System.out.println("area is"+area);
System.out.println("weigth is"+weight);
}
void changeweight(int n)
{weight=n;}
public static void main(String args[]){

Table t;
t= new Table ( );
t.Table("s",12,13,14,15);
t.area();
t.display();
t.changeweight(16);
t.display();
}
}

class Table{
int weight,wide,length,high,area;
char name;
Table(char x,int y,int z,int l,int m)
{name=x;
length=y;
wide=z;
high=l;
weight=m;
}
void area()
{area=length*wide;}
void display()
{
System.out.println(\"name is\"+name);
System.out.println(\"length is\"+length);
System.out.println(\"wide is\"+wide);
System.out.println(\"high is\"+high);
System.out.println(\"area is\"+area);
System.out.println(\"weigth is\"+weight);
}
void changeweight(int n)
{weight=n;}
public static void main(String args[]){

Table t;
t= new Table('s',12,13,14,15);
t.area();
t.display();
t.changeweight(16);
t.display();
}
}

楼主还是好好学学基本功吧

t= new Table ( );
t.Table("s",12,13,14,15);

你已经自己定义了一个构造函数，系统就不会生成默认的空的构造函数，所以会出问题，在说你上面的写法也有问题。

你的"s"也是一个问题,因为你在构造函数中定义的是char,而在传递时却是"s",是string

JAVA中是不允许这样调用的

好厉害的大师们谢谢