替换Java字符串中的子字符串
假设以下是我们的字符串。
String str = "行尸走肉！";
我们想将子字符串“Dead”替换为“Alive”。为此，让我们使用以下逻辑。在这里，我们使用了while循环，并在其中找到了要替换的子字符串的索引。这样，我们一个接一个地替换了整个子字符串。
int beginning = 0, index = 0;
StringBuffer strBuffer = new StringBuffer();
while ((index = str.indexOf(subStr1, beginning)) >= 0) {
strBuffer.append(str.substring(beginning, index));
strBuffer.append(subStr2);
beginning = index + subStr1.length();
}以下是替换子字符串的完整示例。
示例
public class Demo {
public static void main(String[] args) {
String str = "行尸走肉！";
System.out.println("String: "+str);
String subStr1 = "Dead";
String subStr2 = "Alive";
int beginning = 0, index = 0;
StringBuffer strBuffer = new StringBuffer();
while ((index = str.indexOf(subStr1, beginning)) >= 0) {
strBuffer.append(str.substring(beginning, index));
strBuffer.append(subStr2);
beginning = index + subStr1.length();
}
strBuffer.append(str.substring(beginning));
System.out.println("String after replacing substring "+subStr1+" with "+ subStr2 +" = "+strBuffer.toString());
}
}输出结果
String: 行尸走肉！ String after replacing substring Dead with Alive = The Walking Alive!