总结：
Java 中的字符串中删除子字符串有以下方法:
1.Using replace method使用替换方法
2.Using Charsequence使用字符序列
3.Replace the Substring with an empty string用空字符串替换子字符串
4.Using String’s replaceFirst method使用 String 的 replaceFirst 方法
5.replaceFirst() method
6.Using replaceAll method 使用 replaceAll 方法
7.replaceAll() method
8.Using String Builder’s delete() method使用 String Builder 的 delete() 方法
9.Using StringBuilder replace() Method使用 StringBuilder replace() 方法
1.Using replace method使用替换方法
string.replace(char oldChar, char newChar)
public class Test {
public static void main(String[] args) {
String para = "Java is a beautiful language";
String replace = para.replace('e', 'o');
System.out.println(replace);
}
}
Java is a boautiful languago
2.Using Charsequence使用字符序列
string.replace(char oldChar, char newChar)
public class Test {
public static void main(String[] args) {
String para = "Java is a beautiful language";
String replace = para.replace("Java", "python");
System.out.println(replace);
}
}
python is a beautiful language
3. Replace the Substring with an empty string用空字符串替换子字符串
string.replace(char oldChar, empty char)
public class Test {
public static void main(String[] args) {
String para = "Java is a beautiful language";
String replace = para.replace("beautiful", "");
System.out.println(replace);
}
}
Java is a language
4.Using String’s replaceFirst method使用 String 的 replaceFirst 方法
string.replaceFirst(No. of digit, new digit)
只有字符串的前两位数字会被这个数字改变；其余数字将保持不变。
public class Test {
public static void main(String[] args) {
String para = "John is 101 years old, and Mary is 20 years old";
String replace = para.replaceFirst("\\d\\d\\d", "20");
System.out.println(replace);
}
}
John is 20 years old, and Mary is 20 years old
5.replaceFirst() method
string.replace(No. of digit, empty char)
public class Test {
public static void main(String[] args) {
String para = "John is 101 years old, and Mary is 20 years old";
String replace = para.replaceFirst("\\d\\d\\d", "");
System.out.println(replace);
}
}
John is years old, and Mary is 20 years old
6 Using replaceAll method 使用 replaceAll 方法
String replaceAll(No. of digit, int new number)
public class Test {
public static void main(String[] args) {
String para = "John is 101 years old, and Mary is 20 years old";
String replace = para.replaceAll("\\d\\d\\d", "30");
System.out.println(replace);
}
}
John is 30 years old, and Mary is 20 years old
7.replaceAll() method
string.replace(No. of digit, empty char)
public class Test {
public static void main(String[] args) {
String para = "John is 10 years old, and Mary is 20 years old";
String replace = para.replaceAll("\\d\\d", "");
System.out.println(replace);
}
}
John is years old, and Mary is years old
8.Using String Builder’s delete() method使用 String Builder 的 delete() 方法
public StringBuilder delete(int start,int end)
为了在字符串中添加和删除字符，StringBuilder 包含一个可修改的字符序列。 一个初始容量为 16 个字符的字符串构建器由空的 StringBuilder 函数 Object() { [native code] } 创建，如果内部缓冲区溢出，则会自动创建一个更大的字符串构建器。 要从字符串中删除的子字符串的开始和结束指定为 delete() 函数的第一个和第二个 int 参数。 最后一个索引是独占的，因为它从第二个参数中减去一个，但起始索引是包含在内的。
public class Test {
public static void main(String[] args) {
String para = "John is 10 years old, and Mary is 20 years old";
StringBuilder stringBuilder = new StringBuilder(para);
StringBuilder builder = stringBuilder.delete(7, 19);
System.out.println(builder);
}
}
John isd, and Mary is 20 years old
9.Using StringBuilder replace() Method使用 StringBuilder replace() 方法
string.replace(int start, int end, char newChar)
replace() 函数和 delete() 方法之间的唯一区别是第三个参数，它用于替换已从字符串中删除的字符。 如果需要替换的字符串很大，则会增加大小以容纳字符串的长度。文章来源：https://www.toymoban.com/news/detail-587677.html
函数 toString() { [native code] }() 函数可用于在该方法返回 StringBuilder 后打印更新的字符串。文章来源地址https://www.toymoban.com/news/detail-587677.html
public class Test {
public static void main(String[] args) {
String para = "John is 10 years old, and Mary is 20 years old";
StringBuilder stringBuilder = new StringBuilder(para);
StringBuilder builder = stringBuilder.replace(7, 19," 12 years ol");
System.out.println(builder);
}
}
John is 12 years old, and Mary is 20 years old
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