数组合并

  String[] str1 = {"Hello","world","java"};
  String[] str2 = {"Veriable","syntax","interator"};
  int str1Length = str1.length;
  int str2length = str2.length;
     
  str1 = Arrays.copyOf(str1, str1Length+str2length);//数组扩容
  System.arraycopy(str2, 0, str1, str1Length, str2length);
  System.out.println(Arrays.toString(str1));