类型转换

1.字符串转化为数组

char[] chars=str.toCharArray();

2.数值型字符串转化为double/int类型

double a=Double.parseDouble(str);

int b=Integer.parseInt(str);

3.整数化为字符串

int numer=123;

String s=number+"";

4.字符数组转字符串

 char[]chars=new char[] {'a','b','c'};
         String str=new String(chars);

5.字符串数组转字符串，只能通过循环

String[] str = {"abc", "bcd", "def"};

StringBuffer sb = new StringBuffer();

for(int i = 0; i < str.length; i++){

sb. append(str[i]);

}

String s = sb.toString();