1.字符串转字符串数组
String str="abcde";
char[]ch =str.toCharArray();
2.字符串数组转为字符串
//将数组转成字符串~~~~
String[] aa ={"z","s","l","s"};
String s = Arrays.toString(aa);
3.字符数组转为字符串
//方法一:
String str = "abcde";
char[] ch = str.toCharArray();
String s = String.valueOf(ch);
System.out.println(s);
//方法二:
char data[] = {'a', 'b', 'c'};
String str = new String(data);
4.截取字符串指定索引起始
String str = "abcde";
String s = str.substring(1, 3);//注意区间是左开右闭
5.字符串转为大小写
String str = "abcde";
String s = str.toUpperCase();
String s = str.toLowerCase();
6,String中的split的正则分割
public String[] split(String regex)
//regex为给定的需要分割字符串规则
例如,字符串"boo:and:foo"使用以下表达式得到以下结果:
Regex Result
: { "boo", "and", "foo" }
o { "b", "", ":and:f" }
7.String中替换其中的某一指定的字符
public String replace(char oldChar,char newChar);
//例子
"mesquite in your cellar".replace('e', 'o')
结果为: "mosquito in your collar"