總結(jié)：

Java 中的字符串中刪除子字符串有以下方法:
1.Using replace method使用替換方法
2.Using Charsequence使用字符序列
3.Replace the Substring with an empty string用空字符串替換子字符串
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使用替換方法

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用空字符串替換子字符串

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)

只有字符串的前兩位數(shù)字會被這個數(shù)字改變；其余數(shù)字將保持不變。

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)

為了在字符串中添加和刪除字符，StringBuilder 包含一個可修改的字符序列。 一個初始容量為 16 個字符的字符串構(gòu)建器由空的 StringBuilder 函數(shù) Object() { [native code] } 創(chuàng)建，如果內(nèi)部緩沖區(qū)溢出，則會自動創(chuàng)建一個更大的字符串構(gòu)建器。 要從字符串中刪除的子字符串的開始和結(jié)束指定為 delete() 函數(shù)的第一個和第二個 int 參數(shù)。 最后一個索引是獨占的，因為它從第二個參數(shù)中減去一個，但起始索引是包含在內(nèi)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() 函數(shù)和 delete() 方法之間的唯一區(qū)別是第三個參數(shù)，它用于替換已從字符串中刪除的字符。 如果需要替換的字符串很大，則會增加大小以容納字符串的長度。

函數(shù) toString() { [native code] }() 函數(shù)可用于在該方法返回 StringBuilder 后打印更新的字符串。文章來源地址http://www.zghlxwxcb.cn/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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