java中数字、字符串、字符数组的转换

  // 数字转换为字符串    int   a = 332;    String str = String.valueOf(a);  //字符串转换为数字    String str = "abcd";     int a = Integer.parseInt(str);   //字符串转化为字符数组     String str = " acbd";     char[] c = str.toCharArray();  //字符数组转化为字符串    char[] c = {'a','b','c'};    String str = String.valueOf(c);