importjava.io.*;publicclassBook{doublesb;doublexb;Book(doublex,doubley){this.sb=x;this.xb=y;}Book(){}publicstaticvoidmain(Stringargs[]){System.out.println("请输入数据：");doublea=0;doubleb=0;doublec=0;doubled=0;Strings;BufferedReaderin=newBuffered