Category Archives: Java

下面语句会出错吗？
你感觉哪一句不会出错呢？

public class Test01
{
    public static void main(String[] atgs)
    {
        System.out.println(1.0/0.0);
        System.out.println(1.0/0);
        System.out.println(1/0.0);
        System.out.println(1/0);
        System.out.println(0/0);
    }
}

你对java中的无穷大和非数了解吗？

1.控制台读入字符串

String pair ="";
try
{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    pair = br.readLine(); 
}
catch(IOException ex)
{
    ex.printStackTrace();
}

2.控制台读入整数

int a=0;
try{
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    a=Integer.parseInt(br.readLine());
    b=Integer.parseInt(br.readLine());
    c=Integer.parseInt(br.readLine());
}catch(IOException ex){
    ex.printStackTrace();
}

3.计算某年某月为星期几

int y=2000,m=1,d=1;
Calendar aCalendar=Calendar.getInstance();
aCalendar.set(Calendar.YEAR,y);
aCalendar.set(Calendar.MONTH, m-1);
aCalendar.set(Calendar.DAY_OF_MONTH, d);
//注意，x为1-7，默认1为星期日
int x=aCalendar.get(Calendar.DAY_OF_WEEK);

1. Basic Tools
These tools are the foundation of the JDK. They are the tools you use to create and build applications.

2. Security Tools
2.1. These security tools help you set security policies on your system and create applications that can work within the scope of security policies set at remote sites.

2.2. These security tools help you obtain, list, and manage Kerberos tickets.

3. Speed Up Tools

4. Remote Method Invocation (RMI) Tools
These tools help to create applications that interact over the Web or other network.

5. Java IDL and RMI-IIOP Tools
These tools are used when creating applications that use OMG-standard IDL and CORBA/IIOP.

6. Java Deployment Tools
Utilities for use in conjunction with deployment of java applications and applets on the web.

7. Java Web Start Tools
Utilities for use in conjunction with Java Web Start.

8. Java Access Bridge Tools

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1. Basic Tools
These tools are the foundation of the JDK. They are the tools you use to create and build applications.

2. Security Tools
2.1. These security tools help you set security policies on your system and create applications that can work within the scope of security policies set at remote sites.

2.2. These security tools help you obtain, list, and manage Kerberos tickets.

3.Internationalization Tools
This tool helps to create localizable applications.

4. Remote Method Invocation (RMI) Tools
These tools help to create applications that interact over the Web or other network.

5. Java IDL and RMI-IIOP Tools
These tools are used when creating applications that use OMG-standard IDL and CORBA/IIOP.

6. Java Deployment Tools
Utilities for use in conjunction with deployment of java applications and applets on the web.

7. Java Web Start Tools
Utilities for use in conjunction with Java Web Start.

See Java Web Start Guide for more information.

8. Java Troubleshooting, Profiling, Monitoring and Management Tools

9. Java Web Services Tools

10. Monitoring Tools
You can use the following tools to monitor JVM performance statistics.

11. Troubleshooting Tools
The following tools can be used for specific troubleshooting tasks.

12. Scripting Tools
The following tool can be used to run scripts that interact with the Java platform.

13. Java Plug-in Tools
Utilities for use in conjunction with the Java Plug-in.