191226

Author: 657122411

src/com/blankj/study/corejava/Test06.java

@@ -0,0 +1,23 @@
+package com.blankj.study.corejava;
+
+import java.util.StringJoiner;
+
+public class Test06 {
+    public static void main(String[] args) {
+        Test t = new Test();
+        System.out.println(t.toString());
+    }
+}
+
+class Test {
+    private Integer a;
+    private int b;
+
+    @Override
+    public String toString() {
+        return new StringJoiner(", ", Test.class.getSimpleName() + "[", "]")
+                .add("a=" + a)
+                .add("b=" + b)
+                .toString();
+    }
+}

src/com/blankj/study/corejava/Test07.java

@@ -0,0 +1,19 @@
+package com.blankj.study.corejava;
+
+public class Test07 {
+    private static Object o = new Object();
+
+    public static void main(String[] args){
+        synchronized(o){
+            System.out.println("锁的是对象不是代码!");
+        }
+    }
+
+    public synchronized void m(){
+        //synchronized(this)
+    }
+
+    public static synchronized void n(){
+        //synchronized(Test07.class)
+    }
+}