测试ReplaceFirst对空格的替换效果

Author: enjoyCoding666

src/main/java/com/string/ReplaceFirstDemo.java

@@ -0,0 +1,30 @@
+package com.string;
+
+/**
+ * @Author: EnjoyCoding
+ * @Date: 2020\4\9 0009 23:16
+ * @Description:
+ */
+public class ReplaceFirstDemo {
+
+	public static void main(String[] args) {
+		String test="a b c defg ";
+		int count = replaceSpaceCount(test);
+		System.out.println(count);
+	}
+
+	public static int replaceSpaceCount(String str) {
+		if (str == null) {
+			return 0;
+		}
+		int count=0;
+		while (str.contains(" ")) {
+			str = str.replaceFirst(" ", "");
+			count++;
+		}
+		System.out.println(str);
+		return count;
+	}
+
+
+}