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1、课后答案网，用心为你服务！ 习题解答第一章 作业题1public class Hello public static void main (String args ) System.out.pintln(“早上好，good Morning”); 2import java.applet.*;import java.awt.*;public class Boy extends Applet public void paint(Graphics g) g.setColor(Color.blue); g.drawString(你好,hello,12,30); 第二章 作业题1public class
2、 ZuoYe2_1 public static void main (String args ) char c=; System.out.println(字母+c+在unicode表中的顺序位置:+(int)c); System.out.println(字母表：); while(c=) System.out.print( +c); c=(char)(c+1); 2import java.util.*;public class ZuoYe2_2 public static void main (String args ) Scanner reader=new Scanner(System.in)
3、; long chengji=1; int m=0; while(reader.hasNextInt() int x=reader.nextInt(); m=m+1; chengji=chengji*x; System.out.println(m+个数的乘积为+chengji); 第三章 作业题1import java.util.*;public class ZuoYe3_1 public static void main (String args ) Scanner reader=new Scanner(System.in); double y=0,x=0; x=reader.nextDou
4、ble(); if(x0) y=-1+3*x; System.out.println(y); 2public class ZuoYe3_2 public static void main(String args) int sum=0,m=3,n=7,a=1; while(a=1000) if(a%m=0&a%n=0) sum=sum+a; a+; System.out.println(sum=+sum); 3public class ZuoYe3_3 public static void main(String args) long sum=0,a=8,item=a,n=10,i=1; for
5、(i=1;i=n;i+) sum=sum+item; item=item*10+a; System.out.println(sum); 4public class ZuoYe3_4 public static void main(String args) double sum=0,a=1,b=1,fuhao=1,item=a/b; int i=1; while(i=1000) sum=sum+fuhao*item; i+; fuhao=fuhao*(-1); b=b+2; item=a/b; System.out.println(sum=+sum); 5public class ZuoYe3_
6、5 public static void main(String args) double sum=0,a=1; int i=1; while(i=10) sum=sum+a; i+; a=a*i; System.out.println(sum=+sum); 8第四章 作业题1class DengCha int start,d; DengCha() DengCha(int start,int d) this.start=start; this.d=d; void setStart(int s) start=s; void setD(int d) this.d=d; int getSum(int
7、 n) int sum=0,i=1; while(i=n) sum=sum+start; start=start+d; i+; return sum; public class ZuoYe4_1 public static void main (String args ) DengCha shulie=new DengCha(2,3); System.out.println(shulie.getSum(100); shulie.setStart(10); shulie.setD(5); System.out.println(shulie.getSum(9); 2 class Letter pu
8、blic void printLetter() for(char c=a;c=0) root1=(-b+Math.sqrt(disk)/(2*a); root2=(-b-Math.sqrt(disk)/(2*a); System.out.printf(方程的根:%f,%fn,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); public void setCoefficient(double a,double b,double c) this.a=a; this.b=b; Squar
9、eEquation.c=c; if(a!=0) boo=true; else boo=false; public class ZuoYe4_3 public static void main(String args ) SquareEquation equation1=new SquareEquation(4,5,1); SquareEquation equation2=new SquareEquation(3,5,-7); equation1.getRoots(); equation2.getRoots(); 4import java.util.Scanner;class A int f(int m,int n) if(m*n0) System.out.println(有负数，程序退出); Syst
