2024-04-13 16:27:13 | 我爱编程网
1)确认你的JDK已安装;
2)在环境变量Path中添加你安装的Java路径下的bin目录,我机器上是C:ProgramFilesJavajdk1.6.0_24in,和其它Path值之间需要用分号隔开;
3)在环境变量ClassPath中添加dt.jar和tools.jar两个库文件;
4)在Command命令行窗口执行java-version命令后,如果得到了正确的Java版本号,说明你的环境变量配置正确;
5)打开记事本,编写一个简单的HelloWorld程序,保存成.java格式文件,文件名和类名必需一致;
6)在Command命令行窗口运行编译命令:javac文件名.java,该命令会将源文件编译为后缀名class的字节码文件;
7)在Command命令行窗口运行执行命令:java文件名,OK,你应该能看到正确的结果了;
//第一个程序!
class P1 {
private int n = 9;
int nn;
P1() {
nn = n;
}
void ma() {
System.out.println("n=" + n);
}
}
public class TestC1 extends P1 {
public static void main(String[] args) {
P1 m1 = new P1();
System.out.println("m1.nn=" + m1.nn);
m1.ma();
}
}
//第二个程序
class TestC2 {
public static void main(String args[]) {
Thread First = new MyThread("A");
First.setPriority(Thread.MIN_PRIORITY);
Thread Second = new MyThread("B");我爱编程网
Second.setPriority(Thread.NORM_PRIORITY);
Thread Third = new MyThread("C");
Third.setPriority(Thread.MAX_PRIORITY);
First.start();
Third.start();
Second.start();
}
}
class MyThread extends Thread {
String message;
MyThread(String message) {
this.message = message;
}
public void run() {
for (int i = 0; i < 2; i++)
System.out.println(message + ":" + getPriority());
System.out.println(message + "" + getPriority());
}
}
//第三个程序
import java.awt.*;
import java.applet.*;
class cc {
static int n;
int nn;
static {
n = 20;
}
cc() {
nn = n;
}
}
public class TestC3 extends Applet {
public void paint(Graphics g) {
cc m = new cc();
cc m1 = new cc();
g.drawString("m1=" + m1.nn, 20, 50);
g.drawString("m=" + m.nn, 20, 90);
}
}
我爱编程网(https://www.52biancheng.com)小编还为大家带来java程序运行结果是什么?switch语句的相关内容。
public class Test{
public static void main(String argv[]) {
int i = 3;
switch (i) {
default:
System.out.println("default");
for (; i > 0; i--)
if (i > 1) {
continue;
} else {
{
System.out.println(i);
break;
}
}
case 0:
System.out.println("zero");
break;
case 1:
System.out.println("one");
case 2:
System.out.println("two");
}
}
}
运行结果如下:
2023-12-21 16:29:16
2023-12-24 20:21:11
2024-04-13 17:18:48
2024-04-09 17:44:01
2024-04-04 05:10:44
2024-03-31 15:14:06