lang

whatsmars-common/src/test/java/org/hongxi/java/util/lang/Animal.java

+package org.hongxi.java.util.lang;
+
+/**
+ * @author shenhongxi 2019/8/11
+ */
+public abstract class Animal {
+    private int type;
+
+    Animal() {
+        System.out.println("Animal()");
+    }
+
+    Animal(int type) {
+        this.type = type;
+    }
+
+    abstract void run();
+}

whatsmars-common/src/test/java/org/hongxi/java/util/lang/Cat.java

+package org.hongxi.java.util.lang;
+
+/**
+ * @author shenhongxi 2019/8/11
+ */
+public class Cat extends Animal {
+    private int color;
+
+    Cat() {
+        System.out.println("Cat()");
+    }
+
+    Cat(int type, int color) {
+        super(type);
+        this.color = color;
+    }
+
+    @Override
+    void run() {
+        System.out.println("Cat#run()");
+    }
+}

whatsmars-common/src/test/java/org/hongxi/java/util/lang/ChinaCat.java

+package org.hongxi.java.util.lang;
+
+/**
+ * @author shenhongxi 2019/8/11
+ */
+public class ChinaCat extends Cat {
+    private int province;
+
+    ChinaCat() {
+        System.out.println("ChinaCat()");
+    }
+
+    @Override
+    void run() {
+        System.out.println("ChinaCat#run()");
+    }
+
+    public static void main(String[] args) {
+        Animal animal = new ChinaCat();
+        animal.run();
+    }
+}

whatsmars-common/src/test/java/org/hongxi/java/util/lang/CodeBlockTest.java

+package org.hongxi.java.util.lang;
+
+/**
+ * Created by shenhongxi on 2017/11/17.
+ */
+public class CodeBlockTest {
+
+    int a = 110;
+
+    static int b = 112;
+
+//    static CodeBlockTest instance = new CodeBlockTest(); // 这种情况输出的是2 3 1 4
+
+    static {
+        System.out.println("1 b=" + b); // b=112
+    }
+
+    {
+        System.out.println("2 a=" + a + " b=" + b); // a=110 b=112
+    }
+
+    CodeBlockTest() {
+        System.out.println("3 a=" + a + " b=" + b); // a=110 b=112
+    }
+
+    public static void main(String[] args) { // 1 2 3 2 3 4
+        new CodeBlockTest();
+        new CodeBlockTest();
+        System.out.println("4");
+    }
+}

whatsmars-common/src/test/java/org/hongxi/java/util/lang/ExTest.java

+package org.hongxi.java.util.lang;
+
+/**
+ * Created by shenhongxi on 2018/6/1.
+ */
+public class ExTest {
+
+    public static void main(String[] args) {
+        System.out.println(t(-10));
+    }
+
+    private static int t(int i) {
+        try {
+            System.out.println("try lock");
+            try {
+                if (i < 0) {
+                    throw new RuntimeException("i<0");
+                }
+                if (i > 100) {
+                    return -2;
+                }
+                i++;
+            } finally {
+                System.out.println("release lock");
+            }
+            return i;
+        } catch (Exception e) {
+            return -1;
+        }
+    }
+}