JAVA程序设计 急要 谢谢~~~

class Complex{

private int realPart;

private int imaginPart;

Complex(){

thisrealPart = 0;

thisimaginPart = 0;

}

Complex(int realPart, int imaginPart){

thisrealPart = realPart;

thisimaginPart = imaginPart;

}

public void setRealPart(int realPart){

thisrealPart = realPart;

}

public void setImaginPart(int imaginPart){

thisimaginPart = imaginPart;

}

public int getRealPart(){

return thisrealPart;

}

public int getImaginPart(){

return thisimaginPart;

}

Complex complexAdd(Complex a){

int realPart = thisrealPart + agetRealPart();

int imaginPart = thisimaginPart + agetImaginPart();

return new Complex(realPart, imaginPart);

}

public String toString(){

if(thisimaginPart == 0) return "" + thisrealPart;

else if(thisimaginPart > 0) return "" + thisrealPart + "+" + thisimaginPart + "i";

else return "" + thisrealPart + thisimaginPart + "i";

}

}

public class TestComplex{

public static void main(String[] args){

Complex a = new Complex(1,2);

Complex b = new Complex(3,4);

Complex sum = acomplexAdd(b);

Systemoutprintln("(" + a + ")" + "+" + "(" + b + ")" + "=" + "(" + sum + ")");

asetRealPart(2);

asetImaginPart(3);

bsetRealPart(bgetRealPart() 2);

bsetImaginPart(bgetImaginPart() 2);

sum = acomplexAdd(b);

Systemoutprintln("(" + a + ")" + "+" + "(" + b + ")" + "=" + "(" + sum + ")");

}

}

int a=2;

int b=1;

double result=0;

for(int i=1;i<=20;i++) {

result+=a/b;

a+=b;

b=a;

}

Systemoutprintln(result);

javanet

类：DatagramPacket

DatagramSocket

或者：ServerSocket

Socket

这些类都有一个返回端口的方法，ServerSocket是getLocalPort() ，其他三个是getPort()。如果返回的端口是80，那么就禁止接收或者发送数据，并给与适当的提示信息。

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