实验3使用package语句与import语句
1．答案：无
2．模板代码
SquareEquation.java
packagetom.jiafei;
publicclassSquareEquation
{
doublea,b,c;
doubleroot1,root2;
booleanboo;
publicSquareEquation(doublea,doubleb,doublec)
{
this.a=a;
this.b=b;
this.c=c;
if(a!=0)
{
boo=true;
}
else
{
boo=false;
}
}
publicvoidgetRoots()
{
if(boo)
{
System.out.println("是一元2次方程");
doubledisk=bb-4ac;
if(disk>=0)
{
root1=(-b+Math.sqrt(disk))/(2a);
root2=(-b-Math.sqrt(disk))/(2a);
System.out.printf("方程的根:%f,%f\n",root1,root2);
}
else
{
System.out.printf("方程没有实根\n");
}
}
else
{
System.out.println("不是一元2次方程");
}
}
publicvoidsetCoefficient(doublea,doubleb,doublec)
{
this.a=a;
this.b=b;
this.c=c;
if(a!=0)
{
boo=true;
}
else
{
boo=false;
}
}
}
SunRise.java
importtom.jiafei.;
classSunRise
{
publicstaticvoidmain(Stringargs[])
{
SquareEquationequation=newSquareEquation(4,5,1);
equation.getRoots();
equation.setCoefficient(-3,4,5);
equation.getRoots();
}
}
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