Java编程算法基础-自顶向下风格
自顶向下风格: 1.把大的任务不断的分解成更小的任务
2.忽略细节,把握整体的框架
程序问题-------->制定框架--------->逐步细化---------->逐步精化
打印:
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ $ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ $ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ $ $ $ $ $ $ $ $
$ $ $ $ $ $ $ $ $
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
package NO3;
public class test01 {
private static void print(char[][] ch){
for(int i = 0; i < ch.length; i++){
for(int j = 0; j < ch[i].length;j++){
if(ch[i][j] == 0)
System.out.print(" ");
else
System.out.print(ch[i][j]);
}
System.out.println();
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
char[][] cache = new char[20][50];
for(int i = 0; i < 4;i++)
line_h(cache,i * 3,0,33);
for(int i = 0; i < 9;i++)
line_l(cache, i * 4 ,0,10);
//cache[1][1] = '$';
//cache[1][2] = '$';
print(cache);
}
private static void line_l(char[][] cache, int row,int line1, int line2) {
// TODO Auto-generated method stub
for(int i = line1; i < line2;i++)
cache[i][row] = '$';
}
private static void line_h(char[][] cache, int line, int row1 , int row2) {
// TODO Auto-generated method stub
for(int i = row1 ;i < row2; i++){
cache[line][i] = '$';
}
}
}
在中文Windows环境下，控制台窗口中也可以用特殊符号拼出漂亮的表格来。
比如：
┌─┬─┐
│ │ │
├─┼─┤
│ │ │
└─┴─┘
其实，它是由如下的符号拼接的：
左上 = ┌
上 = ┬
右上 = ┐
左 = ├
中心 = ┼
右 = ┤
左下= └
下 = ┴
右下 = ┘
垂直 = │
水平 = ─
本题目要求编写一个程序，根据用户输入的行、列数画出相应的表格来。
例如用户输入：
3 2
则程序输出：
┌─┬─┐
│ │ │
├─┼─┤
│ │ │
├─┼─┤
│ │ │
└─┴─┘
用户输入：
2 3
则程序输出：
┌─┬─┬─┐
│ │ │ │
├─┼─┼─┤
│ │ │ │
└─┴─┴─┘
package NO3;
import java.util.Scanner;
public class Test03 {
public static void main(String[] args) {
// TODO Auto-generated method stub
String[][] ss = new String[20][50];
Scanner input = new Scanner(System.in);
int line = input.nextInt();
int row = input.nextInt();
line_top(ss,0,0,row + 1);
line_bottom(ss, line * 2, 0, row + 1);
for(int i = 1; i < line; i++)
line_center(ss, i * 2 , 0 ,row +1);
for(int i = 0; i < line; i++)
line_else(ss,i * 2 + 1 ,0, row + 1);
print(ss);
}
private static void line_else(String[][] ss, int line, int row1, int row2) {
// TODO Auto-generated method stub
for(int i = row1; i < row2; i++){
ss[line][i] = "│";
}
}
private static void line_center(String[][] ss, int line, int row1, int row2) {
// TODO Auto-generated method stub
for(int i = row1; i < row2; i++){
if(i == row1)
ss[line][i] = "├";
else if(i == row2 - 1)
ss[line][i] = "┤" ;
else
ss[line][i] = "┼";
}
}
private static void line_bottom(String[][] ss, int line, int row1, int row2) {
// TODO Auto-generated method stub
for(int i = row1; i < row2; i++){
if(i == row1)
ss[line][i] = "└";
else if(i == row2 - 1)
ss[line][i] = "┘";
else
ss[line][i] = "┴";
}
}
private static void line_top(String[][] ss, int line, int row1, int row2) {
// TODO Auto-generated method stub
for(int i = row1; i < row2; i++){
if(i == row1)
ss[line][i] = "┌";
else if(i == row2 - 1)
ss[line][i] = "┐";
else
ss[line][i] = "┬";
}
}
private static void print(String[][] ss) {
// TODO Auto-generated method stub
for(int i = 0; i < ss.length; i++){
for(int j = 0; j < ss[i].length; j++){
if(ss[i][j] == null)
System.out.print(" ");
else
System.out.print(ss[i][j]);
}
System.out.println();
}
}
}