Java 编译器错误。 For 循环不是语句

Question

所以我正在做一个作业，我们必须使用嵌套的 for 循环并传递参数来创建树的 ASCII 图片。我一生都无法弄清楚它没有编译是出了什么问题。

来源如下:

public class Tree{

  public static void main(String [] args){

    drawTree(3,4);     
  }

  public static String drawTree(int n, int h){ //n is number of bodies, h is their height.

    for(int i; i = 1; i <= h; i++){ //Number of tree bodies to create
      drawSegment(n);
      }

//Trunk
    for(int i; i = 1; i <= h - 1; i++){ //Trunk spaces
      System.out.print (" ");    
    }

    System.out.print ("*"); //Trunk Body

    for (int i; i = 1; i <= h - 1; i++){ //Trunk end spaces
      System.out.print (" ");
    }
  }

//Leaves  
  public static String drawSegment(int k){ //Creates the tree's bodies 

    for(int i; i = 1; i <= k; i++){ //Number of lines  

      for(int s; s = 1; s <= k - 1; s++){ //Number of Spaces
    System.out.print (" ");      
      }

      for(int s; s <= (2 * i) - 1; s++){ //Number of Stars
    System.out.print ("*");
      }

      for(int s; s = 1; s <= k - 1; s++){ //Number of End Spaces
    System.out.println (" ");      
      }

     }
   }
}

这些是错误:

Tree.java:10: error: not a statement
    for(int i; i = 1; i <= h; i++){ //Number of tree bodies to create
                    ^
Tree.java:10: error: ')' expected
    for(int i; i = 1; i <= h; i++){ //Number of tree bodies to create
                        ^
Tree.java:10: error: ';' expected
    for(int i; i = 1; i <= h; i++){ //Number of tree bodies to create
                             ^
Tree.java:15: error: not a statement
    for(int i; i = 1; i <= h - 1; i++){ //Trunk spaces
                    ^
Tree.java:15: error: ')' expected
    for(int i; i = 1; i <= h - 1; i++){ //Trunk spaces
                            ^
Tree.java:15: error: ';' expected
    for(int i; i = 1; i <= h - 1; i++){ //Trunk spaces
                                 ^
Tree.java:21: error: not a statement
    for (int i; i = 1; i <= h - 1; i++){ //Trunk end spaces
                     ^
Tree.java:21: error: ')' expected
    for (int i; i = 1; i <= h - 1; i++){ //Trunk end spaces
                             ^
Tree.java:21: error: ';' expected
    for (int i; i = 1; i <= h - 1; i++){ //Trunk end spaces
                                  ^
Tree.java:28: error: not a statement
    for(int i; i = 1; i <= k; i++){ //Number of lines  
                    ^
Tree.java:28: error: ')' expected
    for(int i; i = 1; i <= k; i++){ //Number of lines  
                        ^
Tree.java:28: error: ';' expected
    for(int i; i = 1; i <= k; i++){ //Number of lines  
                             ^
Tree.java:30: error: not a statement
      for(int s; s = 1; s <= k - 1; s++){ //Number of Spaces
                      ^
Tree.java:30: error: ')' expected
      for(int s; s = 1; s <= k - 1; s++){ //Number of Spaces
                              ^
Tree.java:30: error: ';' expected
      for(int s; s = 1; s <= k - 1; s++){ //Number of Spaces
                                   ^
Tree.java:38: error: not a statement
      for(int s; s = 1; s <= k - 1; s++){ //Number of End Spaces
                      ^
Tree.java:38: error: ')' expected
      for(int s; s = 1; s <= k - 1; s++){ //Number of End Spaces
                              ^
Tree.java:38: error: ';' expected
      for(int s; s = 1; s <= k - 1; s++){ //Number of End Spaces
                                   ^
18 errors

我认为这与第一个方法drawTree中的for循环无法找到h.但我不知道如何解决它。

Answer 1

替换

for(int i; i = 1; i <= h; i++)

与:

for(int i = 1; i <= h; i++)