Java StringBuffer replace()方法及示例

StringBuffer.replace()是一个内置的方法，用于用指定的字符串中的字符替换这个序列中的子串中的字符。这里只是简单地删除了子串中的字符，并在开头插入了其他字符。
语法

public StringBuffer replace(int first, int last, String st)

参数： 该方法接受三个参数。

返回值： 该方法在执行上述操作后返回该对象。

异常： 如果first是负数，大于length()，或者大于last，则出现StringIndexOutOfBoundsException。

示例
输入:
StringBuffer= “The first planet of solar system is merrhxy”
first = 39
last = 42
st = “cur”

输出:The first planet of solar system is mercury

下面的程序说明了java.lang.StringBuffer.replace()方法：
程序1

// Java program to illustrate the// java.lang.StringBuffer.replace() import java.lang.*; public class Geeks {     public static void main(String[] args)    {         StringBuffer sbf = new StringBuffer("Welcome to Geekshssgeeks");        System.out.println("string buffer = " + sbf);         // Replacing substring from index 15 to index 18        sbf.replace(15, 18, "for");         System.out.println("After replacing string buffer= " + sbf);    }}

输出

string buffer = Welcome to GeekshssgeeksAfter replacing string buffer= Welcome to Geekforsgeeks

程序2： 当负指数通过时。

// Java program to illustrate the// java.lang.StringBuffer.replace() import java.lang.*; public class Geeks {     public static void main(String[] args)    {         StringBuffer sbf = new StringBuffer("Welcome to Geekshssgeeks");        System.out.println("string buffer = " + sbf);         // Replacing substring from index -15 to index -18        sbf.replace(-15, -18, "for");         System.out.println("After replacing string buffer= " + sbf);    }}

输出

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -15at java.lang.AbstractStringBuilder.replace(AbstractStringBuilder.java:851)at java.lang.StringBuffer.replace(StringBuffer.java:452)at Geeks.main(Geeks.java:14)

程序3： 当传递的索引大于长度时

// Java program to illustrate the// java.lang.StringBuffer.replace() import java.lang.*; public class Geeks {     public static void main(String[] args)    {         StringBuffer sbf = new StringBuffer("Welcome to Geekshssgeeks");        System.out.println("string buffer = " + sbf);         // Replacing substring from index 215 to index 218        sbf.replace(215, 218, "for");         System.out.println("After replacing string buffer= " + sbf);    }}

输出

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: start > length()at java.lang.AbstractStringBuilder.replace(AbstractStringBuilder.java:853)at java.lang.StringBuffer.replace(StringBuffer.java:452)at Geeks.main(Geeks.java:14)