/ *
String interception method:
public String substring (int index): the parameters taken from a position aligned to the end of the string, returns the new string.
public String substring (int begin, int end): begin taken from the start until the end of End, intermediate string.
Note: [begin, end), containing the left and the right are not included.
* /
public class Demo03Substring {
public static void main(String[] args) {
String str1 = "HelloWorld";
String str2 = str1.substring(5);
System.out.println(str1); // HelloWorld,原封不动
System.out.println(str2); // World,新字符串
System.out.println("================");
String str3 = str1.substring(4,7);
System.out.println(str3); // oWo
System.out.println("================");
// 下面这种写法,字符串的内容仍然是没有改变的
// 下面有两个字符串:"Hello","Java"
// strA当中保存的是地址值。
// 本来地址值是Hello的0x666,
// 后来地址值变成了Java的0x999
String strA = "Hello";
System.out.println(strA); // Hello
strA = "Java";
System.out.println(strA); // Java
}
}