Java之旅_高级教程_实例_打印图形

1.打印菱形

public class MainClass{
    public static void main(String[] args){
        printStar(10);
    }
    public static void printStar(int star){
        if(star%2==0){
            star++;
        }
        int bank = (star-1)/2;
        for(int n=1;n<star+1;){
            for(int k=bank;k>0;k--){
                System.out.print(" ");
            }
            for(int i=1;i<n+1;i++){            
                System.out.print("*");
            }
            System.out.println();
            n=n+2;
            bank--;
        }
        for(int n=star-2;n>0;){
            for(int k=1;k<bank+3;k++){
                System.out.print(" ");
            }
            for(int i=0;i<n;i++){                    
                System.out.print("*");
            }
            System.out.println();
            n=n-2;
            bank++;
        }
    }
}

2.九九乘法表

public class MainClass{
    public static void main(String[] args){
        for(int i=1;i<10;i++){
            for(int j=1;j<i+1;j++){
                System.out.print(j+"X"+i+"="+i*j);
                System.out.print("  ");
            }
            System.out.println();
        }
    }
}

3.打印三角形

public class MainClass{
    public static void main(String[] args){
        printStar(10);
    }
    public static void printStar(int star){
        if(star%2==0){
            star++;
        }
        int bank = (star-1)/2;
        for(int n=1;n<star+1;){
            for(int k=bank;k>0;k--){
                System.out.print(" ");
            }
            for(int i=1;i<n+1;i++){            
                System.out.print("*");
            }
            System.out.println();
            n=n+2;
            bank--;
        }
    }
}

4.打印倒立的三角形

public class MainClass{
    public static void main(String[] args){
        printStar(10);
    }
    public static void printStar(int star){
        if(star%2==0){
            star++;
        }
        int bank = 0;
        for(int n=star;n>0;){
            for(int k=0;k<bank+1;k++){
                System.out.print(" ");
            }
            for(int i=n;i>0;i--){            
                System.out.print("*");
            }
            System.out.println();
            n=n-2;
            bank++;
        }
    }
}

5.打印菱形

public class MainClass{
    public static void main(String[] args){
        printDiamonds(4);
    }
    public static void printDiamonds(int line){
        int bank=line-1;
        for(int ln=1;ln<line+1;ln++){
            for(int i=0;i<bank+1;i++){
                System.out.print(" ");
            }
            for(int j=0;j<5;j++){
            System.out.print("*");
            }
            bank--;
            System.out.println();
        }                               
    }   
}

6.打印矩形

public class MainClass{
    public static void main(String[] args){
        printDiamonds(4);
    }
    public static void printDiamonds(int line){
        for(int ln=0;ln<line+1;ln++){
            for(int j=0;j<5;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }                                  
}