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JDK7 安装并调试一个 java 程序

2013-06-03 08:58:23| 分类：程序 | 标签： |举报 |字号大中小订阅

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第一步：下载 jdk-7-linux-i586.tar.gz

第二步：解压安装

cd /usr/lib sudo mkdir jvm

sudo tar zxvf jdk-7-linux-i586.tar.gz -C /usr/lib/jvm cd /usr/lib/jvm sudo mv jdk1.7.0/ java-7-sun

第三步：修改环境变量

vim ~/.bashrc

（如果没有安装vim先执行：sudo apt-get install vim）

export JAVA_HOME=/usr/lib/jvm/java-7-sun export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH

加到末尾

保存退出

source ~/.bashrc

第四步：配置默认JDK版本

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java-7-sun/bin/java 300 sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java-7-sun/bin/javac 300 sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java-7-sun/bin/jar 300

检查

sudo update-alternatives --config java

java version "1.7.0_01" Java(TM) SE Runtime Environment (build 1.7.0_01-b08) Java HotSpot(TM) Client VM (build 21.1-b02, mixed mode)

第六步：测试

package ubuntu.java.basic;

import java.util.*;

public class ArrayTest {

public static void main(String[] args) {

int[] a = new int[5];

for ( int i=0;i<a.length;i++)

a[i] = i*i;

System.out.println(Arrays.toString(a));

String[] b = {"hello","world","hi","you","good"};

System.out.println(Arrays.toString(b));

}

$ cd JavaTrain
~/JavaTrain$ ls
~/JavaTrain$ ls
ArrayTest.java

~/JavaTrain$ javac -d . ArrayTest.java
~/JavaTrain$ ls
ArrayTest.java ubuntu

~/JavaTrain$ java ubuntu.java.basic.ArrayTest
[0, 1, 4, 9, 16]
[hello, world, hi, you, good]

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