Java编程之双重循环打印图形

public static void main(String[] args) {
  // TODO Auto-generated method stub
  int num=0;
  System.out.println("请输入直角三角形的行数:");
  Scanner input=new Scanner(System.in);
  num=input.nextInt();
  for(int i=1;i<=num;i++){
    for(int k=1;k<=num-i+1;k++){
      System.out.print("*");
    }
    System.out.print("\n");
  }
}

public static void main(String[] args) {
  int rows=0;
  System.out.println("请输入要求的三角形的行数:");
  Scanner input=new Scanner(System.in);
  rows=input.nextInt();
  for(int i=1;i<=rows;i++){
    for(int j=1;j<=2*i-1;j++){
      System.out.print("*");
    }
    System.out.print("\n");
  }
}

public static void main(String[] args) {
  int num=0;
  System.out.println("请输入三角形所需要的行数:");
  Scanner input=new Scanner(System.in);
  num=input.nextInt();
  for(int i=1;i<=num;i++){
    for(int k=num;k>num-i+1;k--){
      System.out.print(" ");
    }
    for(int j=num;j>=i;j--){
      System.out.print("*");
    }
    System.out.println();
  }
  System.out.println();
}

public static void main(String[] args) {
  int num=0;
  System.out.println("请输入打印的三角形行数:");
  Scanner input=new Scanner(System.in);
  num=input.nextInt();
  for(int i=1;i<=num;i++){
    for(int k=num;k>0;k--){
      if(k<=i){
        System.out.print("*");
      }else{
        System.out.print(" ");
      }
    }
    System.out.println();
  }
}

public static void main(String[] args) {
  int num=0;
  System.out.println("请输入要打印三角形的行数:");
  Scanner input=new Scanner(System.in);
  num=input.nextInt();
  for(int i=1;i<=num;i++){
    for(int k=0;k<=num-i;k++){
      System.out.print(" ");
    }
    for(int j=1;j<=2*i-1;j++){
      System.out.print("*");
    }
    System.out.print("\n");
  }
}

public static void main(String[] args) {
  int num=0;
  System.out.println("请输入要求的三角形行数:");
  Scanner input=new Scanner(System.in);
  num=input.nextInt();
  for(int i=1;i<=num;i++){
    for(int m=num-1;m>num-i;m--){
      System.out.print(" ");
    }
    for(int j=num;j>=i;j--){
      System.out.print("* ");
    }
    System.out.println();
  }
}

public static void main(String[] args) {
  for(int i=0;i<5;i++){  
    for(int j=0;j<5;j++){
      System.out.print("*");
    }
    System.out.print("\n");
  }
}

public static void main(String[] args) {
   int hangshu = 11; 
    int yiban = hangshu / 2 + 1; 
    int yibanduo = hangshu / 2; 
    System.out.println("空心菱形："); 
    for(int k = 1;k <= yiban;k++){ 
      for(int i = 1;i <= (yiban - k);i++){ 
        System.out.print(" "); 
      } 
      System.out.print("*"); 
      for(int i = 1;i <= ( (k - 2) * 2 + 1);i++){ 
        System.out.print(" "); 
      } 
      if(k != 1){ 
        System.out.print("*");  
      } 
      System.out.println(); 
    } 
    for(int k = yibanduo;k >=1;k--){ 
      for(int i = 1;i <= (yiban - k);i++){ 
        System.out.print(" "); 
      } 
      System.out.print("*"); 
      for(int i = 1;i <= ( (k - 2) * 2 + 1);i++){ 
        System.out.print(" "); 
      } 
      if(k != 1){ 
        System.out.print("*");  
      } 
      System.out.println(); 
    } 


    System.out.println("实心菱形："); 
    for(int i = 1;i <= hangshu;i++){ 
      if(i <= hangshu/2 + 1){ 
        for(int k = 1;k <= hangshu/2 + 1- i;k++){ 
          System.out.print(" "); 
        } 
        for(int k = 1;k <= i;k++){ 
          System.out.print("* "); 
        } 
          System.out.println(); 
      }else{ 
        for(int k =1;k <= (i -(hangshu/2 + 1));k++){ 
          System.out.print(" "); 
        } 
        for(int k = 1;k <= (2 *(hangshu/2 + 1) - i);k++){ 
          System.out.print("* "); 
        } 
        System.out.println(); 
      }   
    } 
}

public static void main(String[] args) {
   for (int i = 0; i < 5; i++) {//打印行 
      for (int j = 0; j < 4-i; j++) {//打印空格 
        System.out.print(" ");//引号中间加空格 
      } 
      for (int j = 0; j < 6; j++) {//打印列 
        System.out.print("*"); 

      } 
      System.out.println();//换行 
    } 
}

public static void main(String[] args) {
  int num=9;
  for(int i=1;i<=num;i++){
    for(int j=1;j<=i;j++){
      System.out.print(j+"*"+i+"="+j*i+" ");
    }
    System.out.println();
  }
}

public class TestNineNine {
	public static void main(String[] args) {
		for (int b=1;b<=9;b++) {
			for (int a=1;a<=9;a++) {
				int c = a*b;
				System.out.print(c+"/"+a+"="+b+"\t");
			}
			System.out.println();
		}
	}