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Java第十四天
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‎day14/API要掌握的简化图解.bmp‎

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‎day14/code/day14_BigInteger_BigDecimal/.classpath‎

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎day14/code/day14_BigInteger_BigDecimal/.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>day14_BigInteger_BigDecimal</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>

‎day14/code/day14_BigInteger_BigDecimal/.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=1.7
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=1.7
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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=1.7

‎day14/code/day14_BigInteger_BigDecimal/bin/cn/itcast_01/BigIntegerDemo.class‎

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‎day14/code/day14_BigInteger_BigDecimal/bin/cn/itcast_01/BigIntegerDemo2.class‎

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‎day14/code/day14_BigInteger_BigDecimal/bin/cn/itcast_02/BigDecimalDemo.class‎

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‎day14/code/day14_BigInteger_BigDecimal/bin/cn/itcast_02/BigDecimalDemo2.class‎

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‎day14/code/day14_BigInteger_BigDecimal/src/cn/itcast_01/BigIntegerDemo.java‎

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package cn.itcast_01;
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import java.math.BigInteger;
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/*
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* BigInteger:可以实现大整数的计算
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* 构造方法：BigInteger(String val)
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*/
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public class BigIntegerDemo {
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public static void main(String[] args) {
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// System.out.println(Integer.MAX_VALUE); // 2147483647
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// Integer i = new Integer("2147483648"); // NumberFormatException
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// System.out.println(i);
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BigInteger bi = new BigInteger("2147483648");
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System.out.println(bi);
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}
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}

‎day14/code/day14_BigInteger_BigDecimal/src/cn/itcast_01/BigIntegerDemo2.java‎

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package cn.itcast_01;
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import java.math.BigInteger;
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public class BigIntegerDemo2 {
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public static void main(String[] args) {
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BigInteger bi1 = new BigInteger("20");
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BigInteger bi2 = new BigInteger("10");
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// public BigInteger add(BigInteger val)
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System.out.println("add:" + bi1.add(bi2));
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// public BigInteger subtract(BigInteger val)
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System.out.println("subtract:" + bi1.subtract(bi2));
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// public BigInteger multiply(BigInteger val)
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System.out.println("multiply:" + bi1.multiply(bi2));
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// public BigInteger divide(BigInteger val)
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System.out.println("divide:" + bi1.divide(bi2));
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// public BigInteger[] divideAndRemainder(BigInteger val)
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BigInteger[] bis = bi1.divideAndRemainder(bi2);
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for (int x = 0; x < bis.length; x++) {
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System.out.println(bis[x]);
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}
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}
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}

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