java 导入自定义类

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2024-08-16 13:11:30 223人阅读

eclipse导入很容易，昨天上课学了一下用记事本写java，导入自定义类，这就麻烦了。

代码贴一下，方便操作：

package tom.jiafei;public class SquareEquation {        double a,b,c;    double root1,root2;        boolean boo;        public SquareEquation (double a,double b,double c) {                this.a = a;        this.b = b;        this.c = c;        if(a!=0) boo = true;        else boo = false;    }        public void setCoefficient(double a,double b,double c) {        this.a = a;        this.b = b;        this.c = c;        if(a!=0)            boo = true;        else boo = false;    }        public void getRoots() {        if(boo) {            System.out.println("shi er yuan fang chen shi");            double disk = b*b - 4*a*c;            if(disk>=0) {                root1 = (-b+Math.sqrt(disk)/(2*a));                root2 = (-b-Math.sqrt(disk)/(2*a));                System.out.println("the roots are"+root1+" "+root2);                            }            else System.out.println("mei you jie");                                }        else {            System.out.println("bu shi er yuan fang chen shi gen");        }            }                                }

View Code

import tom.jiafei.*;public class SunRise {    /**     * @param args     */    public static void main(String[] args) {        SquareEquation equation = new SquareEquation(4, 5, 1);        equation.getRoots();        equation.setCoefficient(-3, 4, 5);        equation.getRoots();    }}