利用命令行参数解一元三次方程   packageSolveEquation;   importjava.io.*;   importjava.util.*;   publicclassSolveEquation   {   voidprint()throwsIOException   {   System.out.println("求解一元三次方程");   ScannersLine=newScanner(System.in);   {   SolveEquation.SolveCubicEquationfc=newSolveE