二分法求平方根算法，java源代码

public static double sqabove1(double x,double r1,double r2) {
double r=(r1+r2)/2.0;
double sp=r*r-x;
double esp=1e-6;
if(sp>esp) {
return sqabove1(x,r1,r);
}
else if(sp<esp && sp>-esp) {
return r;
}
else {
return sqabove1(x,r,r2);
}
}
public static double sqbelow1(double x,double r1,double r2) {
double r=(r1+r2)/2.0;
double sp=r*r-x;
double esp=1e-6;
if(sp>esp) {
return sqbelow1(x,r1,r);
}
else if(sp<esp && sp>-esp) {
return r;
}
else {
return sqbelow1(x,r,r2);
}
}
public static double mysqrt(double x) {
if(x>1) {