flyWeight pattern

src/main/java/flyWeight/StringTest.java

@@ -0,0 +1,15 @@
+package flyWeight;
+
+public class StringTest {
+    public static void main(String[] args) {
+        String s1 = "abc";
+        String s2 = "abc";
+        String s3 = new String("abc");
+        String s4 = new String("abc");
+        System.out.println(s1 == s2); // true
+        System.out.println(s1 == s3); // false
+        System.out.println(s3 == s4); // false
+        System.out.println(s3.intern() == s4.intern()); // true intern()从常量池找
+        System.out.println(s3.intern() == s1); // true
+    }
+}