字符串数组转字符串(只能通过for循环):
String[] str = {‘a’, ‘b’, ‘d’};
StringBuffer sb = new StringBuffer();
for(int i = 0; i < str.length;i++){
sb.append(str[i]);
}
String s = sb.toString();
字符数组转字符串可以通过下面的方式:
char[] data = {‘a’, ‘b’, ‘d’};
String s = new String(data);
字符串到字符数组:
String str = “123abc”;
char[] ar = str.toCharArray(); //char数组
for(int i =0;i<ar.length;i++){
System.out.println(ar[i]); //1 2 3 a b c
}
String[] arr = str.split("");
for(int i =0;i<arr.length;i++){ //String数组,不过arr[0]为空
System.out.println(arr[i]); //空 1 2 3 a b c
}
整形到字符串:
String str = Integer.toString(i);
字符串到整形:
int i = Integer.valueOf(str).intValue();
string和stringbuffer的转换
//String -> StringBuffer
13 //创建一个String对象
14 String str = “Hi Java!”;
15 System.out.println(str);
16
17 //方式一:构造方法
18 StringBuffer buffer = new StringBuffer(str);
19 System.out.println(buffer);
20
21 //方式二:通过append方法
22 StringBuffer buffer2 = new StringBuffer();
23 buffer2.append(str);
24 System.out.println(buffer2);
25
26 //StringBuffer -> String
27 //创建一个StringBuffer对象
28 StringBuffer buffer3 = new StringBuffer();
29 buffer3.append(“Happy birthday Java!”);
30 System.out.println(buffer3);
31
32 //方式一:通过构造方法
33 String str2 = new String(buffer3);
34 System.out.println(str2);
35
36 //方式二:通过toString方法
37 String str3 = buffer3.toString();
38 System.out.println(str3);