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‎.classpath‎

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jre1.8.0_144"/>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎.gitignore‎

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/bin/

‎.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>Javabasic</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎.settings/org.eclipse.jdt.core.prefs‎

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.8
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.8

‎src/com/classload/ObjectUtil.java‎

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package com.classload;
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public class ObjectUtil<E> {
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private Class<? extends Object> classO;
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public void getClass(Object o) {
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classO=o.getClass();
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}
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}

‎src/com/fx/Demo01.java‎

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package com.fx;
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public class Demo01 {
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public static void main(String[] args) {
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// 创建不同类型数组： Integer, Double 和 Character
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Integer[] intArray = { 1, 2, 3, 4, 5 };
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Double[] doubleArray = { 1.1, 2.2, 3.3, 4.4 };
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Character[] charArray = { 'H', 'E', 'L', 'L', 'O' };
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System.out.println( "整型数组元素为:" );
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printArray( intArray ); // 传递一个整型数组
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System.out.println( "\n双精度型数组元素为:" );
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printArray( doubleArray ); // 传递一个双精度型数组
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System.out.println( "\n字符型数组元素为:" );
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printArray( charArray ); // 传递一个字符型数组
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}
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public static <E> void printArray(E[] inputArray) {
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for(E element:inputArray) {
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System.out.printf("%s ",element);
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}
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System.out.println();
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}
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}

‎src/com/fx/Demo02.java‎

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package com.fx;
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public class Demo02 {
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public static void main(String[] args) {
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System.out.printf( "%d, %d 和 %d 中最大的数为 %d\n\n",
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3, 4, 5, maximum( 3, 4, 5 ) );
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System.out.printf( "%.1f, %.1f 和 %.1f 中最大的数为 %.1f\n\n",
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6.6, 8.8, 7.7, maximum( 6.6, 8.8, 7.7 ) );
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System.out.printf( "%s, %s 和 %s 中最大的数为 %s\n","pear",
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"apple", "orange", maximum( "pear", "apple", "orange" ) );
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}
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public static <T extends Comparable<T>> T maximum(T x, T y, T z) {
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T max=x;
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if(y.compareTo(max)>0) {
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max=y;
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}
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if(z.compareTo(max)>0) {
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max=z;
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}
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return max;
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}
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}

‎src/com/fx/GenericTest.java‎

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package com.fx;
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import java.util.ArrayList;
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import java.util.List;
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public class GenericTest {
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public static void main(String[] args) {
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List<String> name = new ArrayList<String>();
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List<Integer> age = new ArrayList<Integer>();
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List<Number> number = new ArrayList<Number>();
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name.add("icon");
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age.add(18);
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number.add(314);
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//getUperNumber(name);//1
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getUperNumber(age);//2
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getUperNumber(number);//3
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}
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public static void getData(List<?> data) {
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System.out.println("data :" + data.get(0));
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}
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public static void getUperNumber(List<? extends Number> data) {
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System.out.println("data :" + data.get(0));
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}
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}

‎src/com/jz/Demo01.java‎

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package com.jz;
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/**
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* 进制的转换
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* @author Administrator
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*
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*/
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public class Demo01 {
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public static void main(String[] args) {
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int a=34; //十进制
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int b=0b11; //2进制
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int c=0xf; //16进制
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int d=077; //8进制
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System.out.println(a+","+b+","+c+","+d);
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}
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}

‎src/com/jz/Demo02.java‎

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package com.jz;
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/**
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* 数据类型的转换
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* @author Administrator
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*
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*/
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public class Demo02 {
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public static void main(String[] args) {
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int money=2000000000;
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int year=20;
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int total1=money*year;
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long total2=money*year;
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long total3=(long)money*year;
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System.out.println(total1);
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System.out.println(total2);
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System.out.println(total3);
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//计算一个人70年心跳多少次(假设它每分钟心跳70下)
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int times1=70*60*24*365*70;
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long times2=70l*60*24*365*70;
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System.out.println(times1);
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System.out.println(times2);
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}
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}

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