Java.lang.ArrayIndexOutOfBoundsException

Idle egg ache, looked at the next Yang Hui Triangle Code, also since this found Yang Hui triangle is god same thing, if you see this blog, please you must Baidu under Yang Hui Triangle

The Java code output is as follows

1 /**2  * 3  */4  PackageCom.yuxi.demo;5 6 /**7 * @ClassName: Yanghuitriangle8 * @Description: TODO (Here's a word describing the role of this class)9  * @authorYuxiTen * @date 2015-6-28 a.m. 8:52:52 One  * A  */ -  Public classYanghuitriangle { -      Public Static voidMain (string[] args) { the         inttriangle[][]=New int[12] [];//creating a two-dimensional array -         //traversing the first layer of a two-dimensional array -          for(inti = 0; I <= triangle.length; i++) {//here is the key to generating the exception exception in thread "main" Java.lang.arrayindexoutofboundsexception:12 -                                                     //At Com.yuxi.demo.YanghuiTriangle.main (yanghuitriangle.java:20) +  -  +       //System.out.println ("Triangle.length is" +triangle.length); Atriangle[i]=New int[I+1];//Initialize the size of the second-level array at             //traversing a second-level array -              for(intj=0;j<=i;j++){ -                 //assigns an array element on both sides to a value of 1 -                 if(i==0| | j==0| | j==i) { -Triangle[i][j]=1; -}Else{//other values are calculated by formula inTriangle[i][j]=triangle[i-1][j]+triangle[i-1][j-1]; -                 } toSystem.out.print (triangle[i][j]+ "\ t");//Output array elements +             } -System.out.println ();//line Break the         } *     } $}

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The output is as follows

1121 131 2 141 3 3 151 4 6) 4 161 5 10 10 5 171 6 15 20 15 6 181 7 21 35 35 21 7 191 8 28 56 70 56 28 8 1Ten1 9 36 84 126 126 84 36 9 1 One1 10 45 120 210 252 210 120 45 10 1 A1 11 55 165 330 462 462 330 165 55 11 1 -Exception in thread "main" java.lang.arrayindexoutofboundsexception:12 -At Com.yuxi.demo.YanghuiTriangle.main (yanghuitriangle.java:20)

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In the code for (int i = 0; I <= triangle.length; i++), the <= symbol is used, because in Java, the array subscript = array length, it warns

Java.lang.ArrayIndexOutOfBoundsException