希望各位大侠不吝赐教

2001-08-18 05:16:15 150 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

两个线程轮流打印 1~100 等待通知机制，先上代码 public class PrintABA { public static void main(String[] args){ Number number = new Number(); Thread t1 = new Thread(number); Thread t2 = new Thread(number); t1.setName("线程1"); t2.setName("线程2"); 阅读详情

我设计的一个单值函数类：

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/**the abstract class of function
* designed according to matlab
* Author:weiming
* Vision:1.0
* Date:4/6/2001
*/

package Mathematica.Functions;

public abstract class Function{

public String name="Function";
public String expression=null;
public int type=0;
protected double factor=1.0;

//构造函数，其实现类使用
public Function(String name,String expression,int type){
this.name=name;
this.expression=expression;
this.type=type;
}

public Function(String name,String expression){
this.name=name;
this.expression=expression;
this.type=FunctionType.Unknown;//另实现
}

public Function(String name){
this.name=name;
this.expression=null;
this.type=FunctionType.Unknown；

}

public Function(){
this.name=null;
this.expression=null;
}

public void setName(String str){
this.name=str;
}

public void setExpression(String str){
this.expression=str;
}

public void setType(int type){
this.type=type;
}

public String toString(){
return name+": "+expression;
}

public abstract double value(double[] vars) throws Exception;

}

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我一直都想用一个String类对象expression来构造函数对象，如：

expression="f(x,y,z)=Math.exp(2.0)*(1/x^2)+Math.sin(y)+Math.Log(z)"

那么，这个类就不用声明为abctract,那位大侠能帮我设计这样一个函数，

public double value(double[] vars) throws Exception;

要求读取expression，直接实现单值函数求值。括号中变量依次为var[0],var[1],
var[2]......,如果不用java，能否给我一个dll,函数形如double value(String expression,double[] vars)??

希望各位大侠不吝赐教,小弟在此先谢过了.

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