totome911的专栏

public class PolyTest5{ /*public void run(BMW bmw) { bmw.run(); } public void run(QQ qq) { qq.run(); }*/ public void run(Car car) { car.run(); } public static void main(String[] ar

package com.lee;import java.util.ArrayList;import java.util.Collection;import java.util.Collections;import java.util.Iterator;import java.util.List;import java.util.Set;import java.util.TreeMa

package com.lee;public interface Strategy{ public int calculate(int a , int b); }package com.lee;public class AddStrategy implements Strategy{ public int calculate(int a, int b) { re

package com.lee;import java.util.Iterator;import java.util.Properties;import java.util.Set;public class PropertiseTest{ public static void main(String[] args) { Properties p = System.getPro

package com.lee2;public class GenericFoo{ private T foo; public T getFoo() { return foo; } public void setFoo(T foo) { this.foo = foo; } public static void main(String[] args) {

package com.lee2;public class SimpleCollection{ private T[] objArr; private int index = 0; public SimpleCollection() { objArr = (T[]) new Object[10]; } public SimpleCollection(int capac

public class ArraySearchTest{ /*public static int search(int[]array, int value) { for (int i = 0; i < array.length; i++ ) { if (value == array[i]) { return i; } } return -1; }

package com.lee;import java.util.*;public class ArrayListTest1{ public static void main(String[] args) { ArrayList arrayList = new ArrayList(); arrayList.add("hello"); arrayList.add("wo

import java.util.LinkedList;public class LinkListTest1{ public static void main(String[] args) { LinkedList list = new LinkedList(); list.add("F"); list.add("B"); list.add("D"); lis

import java.util.Collections;import java.util.Comparator;import java.util.Iterator;import java.util.LinkedList;public class CollectionsTest{ public static void main(String[] args) { LinkedL

[com.lee.Student@aa9c3074]package com.lee;import java.util.HashSet;public class SetTest3{ public static void main(String[] args) { HashSet set = new HashSet(); Student s1 = new

import java.util.HashSet;import java.util.Iterator;public class InteratorTest{ public static void main(String[] args) { HashSet set = new HashSet(); set.add("a"); set.add("b"); set.a

import java.util.Comparator;import java.util.Iterator;import java.util.TreeSet;public class TreeSetTest2{ public static void main(String[] args) { TreeSet set = new TreeSet(new PersonComparat

package com.lee;import java.util.HashMap;import java.util.Iterator;import java.util.Set;public class MapTest3{ public static void main(String[] args) { HashMap map = new HashMap(); map

import java.util.LinkedList;public class MyQueue{ private LinkedList list = new LinkedList(); public void put(Object o) { list.addLast(o); } public Object get() { return list.removeF

数组复制public class ArrayCopy{ public static void main(String[] args) { int [] a = new int[]{1,2,3,4}; int [] b = new int[4]; System.arraycopy(a,0,b,0,4); /*public static void arraycopy(O

public class Test3{ public static void main(String[] args) { MyClass myClass = new MyClass(); myClass.output(); myClass.output2(); myClass.output3(); }}interface MyInterface{ public

public class StaticTest{ public static void main(String[] args) { /* MyStatic myStatic = new MyStatic(); MyStatic myStatic2 = new MyStatic(); myStatic.a = 10; System.out.println(myStat

public class Test2{ public static void main(String[] args) { Shape shape = new Triangle(10,6); int area = shape.computeArea(); System.out.println("triangle:" + area); shape = new Rectan

public class StaticTest{ public static void main(String[] args) { new S(); new S(); }}class P{ static //静态代码块 { System.out.println("P static block"); } public P() { System.out.

public class SingletonTest{ public static void main(String[] args) { Singleton singleton = Singleton.getInstance(); //通过静态方法直接调用 Singleton singleton2 = Singleton.getInstance(); System.ou

public class IntegerTest{ public static void main(String[] args) { int a = 10; Integer integer = new Integer(a); int b = integer.intValue(); System.out.println(a == b); }}

public class PolyTest4{ public static void main (String[] args) { A a = null; if(args[0].equals("1")) { a = new B(); } else if(args[0].equals("2")) { a = new C(); } else if

public class StringBufferTest{ public static void main(String[] args) { StringBuffer buffer = new StringBuffer(); buffer.append("hello").append(" world").append(" welcome"); String result =

public class EqualsTest{ public static void main(String[] args) { Student s1 = new Student("zhangsan"); Student s2 = new Student("zhangsan"); System.out.println(s1 == s2); System.out.prin

public class ArrayTest5{ public static void main(String[] args) { int[] [] a = new int [][]{{1,2,3},{4},{5,6,7,8}}; for (int i = 0; i < a.length; i++ ) //数组的行 { for (int j = 0; j < a[i].l

public class ArrayTest{ public static void main(String[] args) { int[] a = new int[4]; a[0] = 1; a[1] = 2; a[2] = 3; a[3] = 4; System.out.println(a[3]); System.out.println("--------

import java.util.Arrays;public class ArrayEquals{ public static boolean isEquals(int[] a , int[] b) { if (a == null || b == null) { return false; } if (a.length != b.length) { re

多线程：后台线程       Thread tt = new TestThread();                     tt.setDaemon(true);   //后台线程                     tt.start();合并线程：               tt.join();静态代码快，线程的同步问题，确保打印票数不会