1 package com.jdk7.chapter1;
2
3 public class ControlFollow {
4 public static int number = 10
;
5
6 /**
7 * if控制语句
8 * @param n
9 */
10 public void ifStatement(
int n){
11 System.out.print(n+" "
);
12 if(n==
number){
13 System.out.println();
14 }
else if(n>
number){
15 this.ifStatement(--
n);
16 }
else{
17 this.ifStatement(++
n);
18 }
19 }
20 /*
21 执行结果：
22 if控制语句
23 20 19 18 17 16 15 14 13 12 11 10
24 10
25 1 2 3 4 5 6 7 8 9 10
26 */
27
28 /**
29 * for控制语句
30 * @param n
31 */
32 public void forStatement(
int n){
33 for(;n<number;n++
){
34 System.out.print(n+" "
);
35 }
36 for(;n>number;n--
){
37 System.out.print(n+" "
);
38 }
39 System.out.println("n : "+
n);
40 }
41 /*
42 执行结果：
43 for控制语句
44 20 19 18 17 16 15 14 13 12 11 n : 10
45 n : 10
46 1 2 3 4 5 6 7 8 9 n : 10
47 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 n : 10
48 */
49
50 /**
51 * while控制语句
52 * @param n
53 */
54 public void whileStatement(
int n){
55 while(n>
number){
56 System.out.print(n--+" "
);
57 }
58 while(n<
number){
59 System.out.print(n+++" "
);
60 }
61 System.out.println(n);
62 }
63 /*
64 执行结果：
65 while控制语句
66 20 19 18 17 16 15 14 13 12 11 10
67 10
68 1 2 3 4 5 6 7 8 9 10
69 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
70 */
71
72 /**
73 * do...while控制语句
74 * @param n
75 */
76 public void doWhileStatement(
int n){
77 if(n>
number){
78 do{
79 System.out.print(n--+" "
);
80 }
while(n>
number);
81 }
else if(n<
number){
82 do{
83 System.out.print(n+++" "
);
84 }
while(n<
number);
85 }
86 System.out.println(n);
87 }
88 /*
89 执行结果：
90 do...while控制语句
91 20 19 18 17 16 15 14 13 12 11 10
92 10
93 1 2 3 4 5 6 7 8 9 10
94 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10
95 */
96
97 /**
98 * switch控制语句
99 * @param n
100 */
101 public void switchStatement(
int n){
102 switch(n){
103 case 11
:
104 System.out.println("n = 11"
);
105 break;
106 case 10
:
107 System.out.println("n = 10"
);
108 break;
109 case 9
:
110 System.out.println("n = 9"
);
111 break;
112 default:
113 System.out.println("n不是11、10、9"
);
114 }
115 /*
116 执行结果：
117 switch控制语句
118 n = 11
119 n = 10
120 n = 9
121 n不是11、10、9
122 */
123
124 }
125 public static void main(String[] args) {
126 ControlFollow cf =
new ControlFollow();
127 System.out.println("if控制语句"
);
128 cf.ifStatement(20
);
129 cf.ifStatement(10
);
130 cf.ifStatement(1
);
131 System.out.println("for控制语句"
);
132 cf.forStatement(20
);
133 cf.forStatement(10
);
134 cf.forStatement(1
);
135 cf.forStatement(-3
);
136 System.out.println("while控制语句"
);
137 cf.whileStatement(20
);
138 cf.whileStatement(10
);
139 cf.whileStatement(1
);
140 cf.whileStatement(-3
);
141 System.out.println("do...while控制语句"
);
142 cf.doWhileStatement(20
);
143 cf.doWhileStatement(10
);
144 cf.doWhileStatement(1
);
145 cf.doWhileStatement(-3
);
146 System.out.println("switch控制语句"
);
147 cf.switchStatement(11
);
148 cf.switchStatement(10
);
149 cf.switchStatement(9
);
150 cf.switchStatement(20
);
151
152
153
154 }
155
156 }
转载于:https://www.cnblogs.com/celine/p/8232798.html
