第六章章节练习

 1 package com.kgc.zzlx;
 2 
 3 public class Zj6011 {
 4     String brand;
 5     public Zj6011(){
 6         this.brand="诺基亚";
 7     }
 8     public Zj6011(String bra){
 9         this.brand=bra;
10     }
11     public String buy(){
12         return "没发工资,买一个"+brand+"牌子的手机吧";
13     }
14     public String buy(String reason){
15         return reason+",买一个"+brand+"牌子的手机吧";
16     }
17 }

 1 package com.kgc.zzlx;
 2 
 3 public class Zj6012 {
 4     public static void main(String[] args){
 5         Zj6011 zj=new Zj6011();
 6         System.out.println(zj.buy());
 7 
 8         zj.brand="苹果";
 9         String detail=zj.buy("发工资拉");
10         System.out.println(detail);
11 
12 
13     }
14 }

 1 package com.kgc.zzlx;
 2 
 3 public class Zj6021 {
 4     int daikuan;
 5     double lilv;
 6     int year;
 7     int yueshu;
 8     public Zj6021(int daikuan,double lilv,int year,int yueshu){
 9         this.daikuan=daikuan;
10         this.lilv=lilv;
11         this.year=year;
12         this.yueshu=yueshu;
13     }
14     //总利息=贷款金额*利率6.03  6.12   6.39
15     public double lixi(){
16         double zonglixi=daikuan*lilv*year;
17         return zonglixi;
18     }
19 
20 
21     //每月还款金额=贷款金额+总利息)/贷款年限
22     public double loan(){
23         double huankuan=(daikuan+lixi())/yueshu;
24         return huankuan;
25     }
26 
27 }

 1 package com.kgc.zzlx;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Zj6022 {
 6     public static void main(String[] args){
 7         Scanner sc=new Scanner(System.in);
 8 
 9 
10         System.out.print("请输入贷款金额:");
11         int daikuan=sc.nextInt();
12         System.out.println("请选择还款年限:1.3年(36个月)\n\t\t2.5年(60个月)\n\t\t3.20年(240个月)");
13         int xz=sc.nextInt();
14         double lilv=0.0;
15         int year=0;
16         int yueshu=0;
17         if (xz==1){
18             lilv=0.0603;
19             year=3;
20             yueshu=36;
21         }else if(xz==2){
22             lilv=0.0612;
23             year=5;
24             yueshu=60;
25         }else if (xz==3){
26             lilv=0.0639;
27             year=20;
28             yueshu=240;
29         }
30         Zj6021 zj=new Zj6021(daikuan,lilv,year,yueshu);
31         System.out.println("总利息是:"+zj.lixi()+"元,每个月利息是"+(zj.lixi()/yueshu)+"元");
32         System.out.println("每月还款金额是:"+zj.loan()+"元");
33     }
34 }

 1 package com.kgc.zzlx;
 2 
 3 public class Zj6031 {
 4 
 5 
 6 
 7     //判断是否为三角形
 8     public boolean is(int a,int b,int c){
 9         boolean flag=false;
10         if (a+b>c && a+c>b && b+c>a){
11             return true;
12         }else{
13             System.out.println("不能成为三角形");
14         }
15         return flag;
16     }
17 
18     //判断是什么三角形
19     public String shape(int a,int b,int c){
20         String shape="";
21         if (a==(b+c)&& b==(a+c)&& c==(a+b)){
22             shape="这是直角三角形";
23         }else if (a>(b+c) && b>(a+c) && c>(a+b)){
24             shape="这是钝角三角形";
25         }else if (a<(b+c) && b<(a+c) && c<(a+b)){
26             shape="这是锐角三角形";
27         }
28         return shape;
29     }
30 }

 1 package com.kgc.zzlx;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Zj6032 {
 6     public static void main(String[] args) {
 7         Scanner sc = new Scanner(System.in);
 8         Zj6031 zj = new Zj6031();
 9         String ies = "";
10 
11         do {
12             System.out.print("请输入第一条边长:");
13             int a = sc.nextInt();
14             System.out.print("请输入第二条边长:");
15             int b = sc.nextInt();
16             System.out.print("请输入第三条边长:");
17             int c = sc.nextInt();
18             zj.is(a, b, c);
19             System.out.println("");
20             ;
21             System.out.println(zj.shape(a, b, c));
22 
23             System.out.println("继续吗(y/n)?");
24             ies = sc.next();
25         } while (ies.equals("y"));
26     }
27 }