CharUtil

Author: AlanGeeker

blogtree-util/src/main/java/org/blogtree/util/common/CharUtil.java

@@ -0,0 +1,34 @@
+package org.blogtree.util.common;
+
+/**
+ * char工具类
+ *
+ * @author AlanGeeker
+ */
+public class CharUtil {
+
+    private static char char_A = 'A';
+    private static char char_Z = 'Z';
+    private static char char_a = 'a';
+    private static char char_z = 'z';
+
+    /**
+     * char 英文字母小写
+     */
+    public static char toLowerCase(char c) {
+        if (c >= char_A && c <= char_Z) {
+            c += 32;
+        }
+        return c;
+    }
+
+    /**
+     * char 英文字母小写
+     */
+    public static char toUpperCase(char c) {
+        if (c >= char_a && c <= char_z) {
+            c -= 32;
+        }
+        return c;
+    }
+}

blogtree-util/src/test/java/org/blogtree/util/common/CharUtilTest.java

@@ -0,0 +1,31 @@
+package org.blogtree.util.common;
+
+import org.blogtree.util.base.BaseTest;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class CharUtilTest extends BaseTest {
+
+    @Test
+    public void toLowerCase() {
+        assert 'a' == CharUtil.toLowerCase('A');
+        assert 'b' == CharUtil.toLowerCase('B');
+        assert 'y' == CharUtil.toLowerCase('Y');
+        assert 'z' == CharUtil.toLowerCase('Z');
+        assert '3' == CharUtil.toLowerCase('3');
+        assert '-' == CharUtil.toLowerCase('-');
+        assert ' ' == CharUtil.toLowerCase(' ');
+    }
+
+    @Test
+    public void toUpperCase() {
+        assert 'A' == CharUtil.toUpperCase('a');
+        assert 'B' == CharUtil.toUpperCase('b');
+        assert 'Y' == CharUtil.toUpperCase('y');
+        assert 'Z' == CharUtil.toUpperCase('z');
+        assert '3' == CharUtil.toLowerCase('3');
+        assert '-' == CharUtil.toLowerCase('-');
+        assert ' ' == CharUtil.toLowerCase(' ');
+    }
+}