java打印出菱形图案实例详解

class ForForTest {
  public static void main(String[] args) {
     
/*
输出如下图形：  行数i:  空格数j：  “*”数目z：
   *       1     3      1
  ***      2     2      3
  *****      3     1      5
 *******     4     0      7
  *****      1     1      5   6
  ***      2     2      3   5
   *       3     3      1   4
 */
    for (int i = 1;i <= 4;i++){
      for (int j = 1;j <= 4 - i;j++) {
        System.out.print(" ");
      }
      for (int z = 1;z <= i*2-1;z++){
        System.out.print("*");
      }
      System.out.println();
    }
    for (int i = 1;i <= 3;i++){
      for (int j = 1;j <= i;j++){
        System.out.print(" ");
      }
      int y = 3;
      for (int z = 5;z >= 2*i-1;z--){
        System.out.print("*");
      }
      System.out.println();
    }
  }
}

import java.util.Scanner;
import java.util.regex.Matcher;
public class test01 {
private static int i;
private String ch;
public static void main(String[] args) {
    runTest();
    }
private void printBlank(int blank){//打空格
    for(int i=blank;i>=1;i--){
        System.out.print(" ");
    }
}
    private void printStar( int sum,String ch){ //打图形
        for(int i=sum;i>=1;i--){
            System.out.print(ch);
        }
    }
    private void printTab(){ //打回车
        System.out.println();
    }
    private void run(int level,String ch){//综合打
        if(ch.length()==1){
            for(i=1;i<=(level+1)/2;i++){
                if(i==1){
                    printBlank((level+1)/2-i);
                    printStar(1,ch);
                    printTab();
                }else{
                    printBlank((level+1)/2-i);
                    printStar(1,ch);
                    printBlank(((level+1)/2+i-1)-((level+1)/2-i)-2); //总元素为 层数+i-1,再减去打印的空格和*号数量.
                    printStar(1,ch);
                    printTab();
                }
            } for(i=(level+1)/2-1;i>=1;i--){
                if(i==1){
                    printBlank((level+1)/2-i);
                    printStar(1,ch);
                    printTab();
                }else{
                    printBlank((level+1)/2-i);
                    printStar(1,ch);
                    printBlank((level+1)/2+i-1-((level+1)/2-i)-2);
                    printStar(1,ch);
                    printTab();
                }
            }
        }else{
            for(i=1;i<=(level+1)/2;i++){
                if(i==1){
                    printBlank((level+1)/2-i+ch.length()/2);
                    printStar(1,ch);
                    printTab();
                }else{
                    printBlank((level+1)/2-i);
                    printStar(1,ch);
                    printBlank(((level+1)/2+i-1)-((level+1)/2-i)-2); //总元素为 层数+i-1,再减去打印的空格和*号数量.
                    printStar(1,ch);
                    printTab();
                }
            } for(i=(level+1)/2-1;i>=1;i--){
                if(i==1){
                    printBlank((level+1)/2-i+ch.length()/2);
                    printStar(1,ch);
                    printTab();
                }else{
                    printBlank((level+1)/2-i);
                    printStar(1,ch);
                    printBlank((level+1)/2+i-1-((level+1)/2-i)-2);
                    printStar(1,ch);
                    printTab();
                }
            }
        }
        }
    public static void runTest() { //判断条件
        Scanner s = new Scanner(System.in);
        try{
            System.out.println("请输入要打印的层数,只能输入大于等于3的奇数 :" );
            int level = s.nextInt();
            String str = String.valueOf(level);
            if(str.matches("[1-9]\\d*")&&Integer.parseInt(str)%2!=0&&Integer.parseInt(str)!=1){
                System.out.println("请输入要打印的形状:" );
                String ch = s.next();
                try{
                    if(ch.matches("[^\u4e00-\u9fa5]+" )){
                        new test01().run(level, ch);
                    }else {
                        throw new Exception();}
                }catch (Exception e) {
                    System.out.println("输入有误!!!不能包含汉字字符,请重新输入");
                    System.out.println("***********************************");
                    runTest(); //递归
                }
            }else if(str.matches("[-9-0]+")){ //
                throw new Exception();
            }
        }catch (Exception e) {
            System.out.println(" 输入有误!!!只能输入大于等于3的奇数,请重新输入");
            System.out.println("***********************************");
            runTest(); //递归
        }
    }
    }