OOP04-Java文字类型的变量和值及其运算

Java字符串(String)分割(split)成字符串数组

文件中保存的数据, 网络传递的数据等常常可以表示为有特定格式的字符串. 例如CSV文件.

Java中String的split()方法具有安装特定的分隔符把字符串(String)分割成字符串数组(String[])的功能.

实测发现: 在待分割的字符串结尾处的出现多个个分隔符号, 都会被忽略.

在待分割的字符串前和其中的都起作用, 分割后的字符串数组中得到空串”“.

public class StringSplit {

public static void main(String[] args) {
splitTest("abc:cd:f");
splitTest("abc:cd:f:");
splitTest("abc:cd:f::");
splitTest("abc:cd::f");
splitTest(":abc:cd:f");
splitTest("::abc:cd:f");
}

protected static void splitTest(String stringToSplit) {
//用:作为分割符
String[] stringArray = stringToSplit.split(":");
System.out.println(stringToSplit);
System.out.println("split by :");
System.out.println("stringArray.length = " + stringArray.length);
for (String field : stringArray) {
System.out.println(field);
}
System.out.println("-----------------------------------");
}
}

运行结果:

abc:cd:f
split by :
stringArray.length = 3
abc
cd
f
-----------------------------------
abc:cd:f:
split by :
stringArray.length = 3
abc
cd
f
-----------------------------------
abc:cd:f::
split by :
stringArray.length = 3
abc
cd
f
-----------------------------------
abc:cd::f
split by :
stringArray.length = 4
abc
cd

f
-----------------------------------
:abc:cd:f
split by :
stringArray.length = 4

abc
cd
f
-----------------------------------
::abc:cd:f
split by :
stringArray.length = 5

abc
cd
f
-----------------------------------