问题描述
大学已完成任务:实现对象的加,减,乘和除的方法。根据复杂坐标创建尺寸为n的集合(哈希集)。将其转移到完成/增加其元素的方法。 我自己意识到了操作方法,但是我不明白为什么需要哈希集以及如何在代码中实现它。我读了文章,但仍然不明白如何应用该类来实现。
对不起,我的英语不好
import java.lang.Math;
public class Complex {
double dReal,dImaginary;
// Constructor methods
public Complex() {}
public Complex( double dReal,double dImaginary ) {
this.dReal = dReal;
this.dImaginary = dImaginary;
}
// Convert complex number to a string
public String toString() {
if (dImaginary >= 0)
return dReal + "+" + dImaginary + "i";
else
return dReal + "-" + -dImaginary + "i";
}
// ================================================================
// Complex number arithmetic
// Compute sum of two complex numbers cA + cB
public Complex Add(Complex cB ) {
Complex sum = new Complex();
sum.dReal = dReal + cB.dReal;
sum.dImaginary = dImaginary + cB.dImaginary;
return (sum);
}
// Compute difference of two complex numbers cA - cB
public Complex Sub( Complex cB ) {
Complex diff = new Complex();
diff.dReal = dReal - cB.dReal;
diff.dImaginary = dImaginary - cB.dImaginary;
return (diff);
}
// Compute product of two complex numbers cA * cB
public Complex Mult( Complex cB ) {
Complex prod = new Complex();
prod.dReal = dReal*cB.dReal - dImaginary*cB.dImaginary;
prod.dImaginary = dImaginary*cB.dReal + dReal*cB.dImaginary;
return (prod);
}
// Compute divisor of two complex numbers cA / cB
public Complex Div( Complex cB ) {
Complex div = new Complex();
double dR,dDen;
if(Math.abs( cB.dReal ) >= Math.abs( cB.dImaginary )) {
dR = cB.dImaginary/cB.dReal;
dDen = cB.dReal + dR*cB.dImaginary;
div.dReal = (dReal + dR*dImaginary)/dDen;
div.dImaginary = (dImaginary - dR*dReal)/dDen;
} else {
dR = cB.dReal/cB.dImaginary;
dDen = cB.dImaginary + dR*cB.dReal;
div.dReal = (dR*dReal + dImaginary)/dDen;
div.dImaginary = (dR*dImaginary - dReal)/dDen;
}
return (div);
}
// ================================================================
// Exercise methods in Complex class
public static void main (String args[]) {
// Setup and print two complex numbers
Complex cA = new Complex( 1.0,2.0 );
Complex cB = new Complex( 3.0,4.0 );
System.out.println("cA = " + cA.toString() );
System.out.println("cB = " + cB.toString() );
// Output
Complex cC = cA.Add( cB );
System.out.println("Complex cA + cB = " + cC.toString() );
Complex cD = cA.Sub( cB );
System.out.println("Complex cA - cB = " + cD.toString() );
Complex cE = cA.Mult( cB );
System.out.println("Complex cA * cB = " + cE.toString() );
Complex cF = cA.Div( cB );
System.out.println("Complex cA / cB = " + cF.toString() );
}
}
解决方法
从复杂坐标创建维度为n的集合(哈希集)。
这只是存储一组n
复数。
将其传输到完成/增加其元素的方法。
使用您拥有的n
方法将所有Mult
复数相乘。
Set<Complex> complexNumbers = new HashSet<>();
//add numbers to it
Optional<Complex> result = complexNumbers.stream()
.reduce((c1,c2) -> c1.Mult(c2)); //or .reduce(Complex::Mult)
注意:Java命名约定是命名方法以小写字母开头(mult
或multiply
是公称名称)