法一:用boolean数组(一些测试用例会越界,没有做边界检查) publicclassSolution{privatestaticStringoperate(boolean[][] arr,String op,inta,intb){switch(op) {case"AND":for(inti=0;i<arr[0].length;i++) { arr[a-1][i] = arr[a-1][i] & arr[b-1]
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There is noreverse()utility method in theStringclass. However, you can create a character array from the string and then iterate it from the end to the start. You can append the characters to a string builder and finally return the reversed string. The following example code shows one way ...
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