Array.sort(array[]);//自然升序排列 Array.copyofRange(ar,indexfrom,indexto);//数组深拷贝 Array.toString(ar);//数组输出,形式[1,2,3]/["ab","avv"]; System.Arraycopy(ar1from,index1,ar2to,index2,len);//数组深拷贝 System.out.printf("%.nf",double/float);//类似于C的保留小数位数,四舍五入 Integer.parseInt(String);//字符串转Integer