Java sistēmas klase satur vairākus noderīgus klases laukus un metodes. Tas nodrošina arī tādas iespējas kā standarta ievade, standarta izvade un kļūdu izvades straumes. To nevar izveidot.

Java System klase ir iekļauta modulī 'java.base' un paketē 'java.lang'.

Java sistēmas klasē mums ir 3 dažādi lauku veidi un 28 dažādu veidu metodes.

Java sistēmas klase sastāv no šādiem laukiem: -

Java sistēmas klases metodes:

Java sistēmas klase sastāv no šādām metodēm:

1. piemērs

 import java.lang.*; public class SystemArrayCopyExample1 { public static void main(String[] args) { String a[]= {&apos;A&apos;,&apos;B&apos;,&apos;B&apos;,&apos;H&apos;,&apos;A&apos;,&apos;M&apos;}; //source array String b[]= {&apos;S&apos;,&apos;H&apos;,&apos;U&apos;,&apos;N&apos;,&apos;U&apos;,&apos;L&apos;,&apos;L&apos;,&apos;J&apos;,&apos;A&apos;,&apos;D&apos;,&apos;O&apos;,&apos;N&apos;}; //destination array String src[],dest[]; int srcPos,destPos,length; src=a; srcPos=2; dest=b; destPos=3; length=4; System.out.print(&apos;Source array:&apos;); for(int i=0;i<src.length;i++) {system.out.print(a[i]);} system.out.println(); system.out.print('destination array:'); for(int i="0;i&lt;src.length;i++)" {system.out.print(b[i]);} system.out.println('source position:'+srcpos); system.out.println('destination position:'+destpos); system.out.println('length:'+length); system.arraycopy(src, srcpos, dest, destpos, length); use of arraycopy() method array after arraycopy()'); <b.length;i++) { system.out.print(b[i]); } < pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Source array:ABBHAM Destination array:SHUNUL Source Position:2 Destination Position:3 Length:4 Destination array after use of arraycopy() SHUBHAMJADON </pre> <h2>Example 2</h2> <pre> public class SystemCurrentTimeMillisExample2 { public static void main(String[] args) { System.out.println(&apos;Current time in millisecond&apos;); System.out.println(System.currentTimeMillis()); //method of calling current time in millisecond } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Current time in millisecond 1532262046724 </pre> <h2>Example 3</h2> <pre> public class SystemLineSeparatorExample3 { public static void main(String[] args) { //use of line separator String a=&apos;Shubham&apos;+System.lineSeparator()+&apos;Jadon&apos;; System.out.println(a); } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Shubham Jadon </pre> <h2>Example 4</h2> <pre> public class SystemNanoTimeExample4 { public static void main(String[] args) { System.out.println(&apos;Current time in nanoseconds = &apos;+System.nanoTime()); } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Current time in nanoseconds = 1316893720017448 </pre> <h2>Example 5</h2> <pre> public class SystemIdentityHashCodeExample5{ public static void main(String[] args) { String a=new String (); a.equals(&apos;Shubham&apos;); System.out.println(&apos;identity hash code of object a = &apos;+System.identityHashCode(a)); String b=new String (); b.equals(&apos;Jadon&apos;); System.out.println(&apos;identity hash code of object b = &apos;+System.identityHashCode(b)); } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> identity hash code of object a = 843730481 identity hash code of object b = 743673026 </pre> <h2>Example 6</h2> <pre> import java.util.Properties; public class SystemGetPropertiesExample6 { public static void main(String[] args) { System.out.println(&apos;Your System property for user&apos;); Properties p = System.getProperties(); System.out.println(p.getProperty(&apos;user.name&apos;)); //property to get User&apos;s account name System.out.println(p.getProperty(&apos;user.home&apos;)); //property to get User&apos;s home directory System.out.println(p.getProperty(&apos;user.dir&apos;)); //property to get User&apos;s current working directory } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Your System property for user shubham C:UsersShubham Jadon C:UsersShubham Jadoneclipse-workspace	point </pre> <h2>Example 7</h2> <pre> import java.util.Properties; public class SystemGetPropertyExample7{ public static void main(String[] args) { //here we created property with my name and assigned its default value ShubhamJadon System.out.println(&apos;my name : &apos;+System.getProperty(&apos;myname&apos;, &apos;Shubham Jadon&apos;)); } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> my name : Shubham Jadon </pre> <h2>Example 8</h2> <pre> public class SystemMpaLibraryNameExample8 { public static void main(String[] args) { System.out.println(&apos;map library for OS&apos;s name = &apos;+System.mapLibraryName(&apos;os.name&apos;)); System.out.println(&apos;map library for OS&apos;s architecture = &apos;+System.mapLibraryName(&apos;os.arch&apos;)); System.out.println(&apos;map library for OS&apos;s version = &apos;+System.mapLibraryName(&apos;os.version&apos;)); } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> map library for OS&apos;s name = os.name.dll map library for OS&apos;s architecture = os.arch.dll map library for OS&apos;s version = os.version.dll </pre> <br></src.length;i++)>

2. piemērs

 public class SystemCurrentTimeMillisExample2 { public static void main(String[] args) { System.out.println('Current time in millisecond'); System.out.println(System.currentTimeMillis()); //method of calling current time in millisecond } } 

Izvade:

 Current time in millisecond 1532262046724 

3. piemērs

 public class SystemLineSeparatorExample3 { public static void main(String[] args) { //use of line separator String a='Shubham'+System.lineSeparator()+'Jadon'; System.out.println(a); } } 

Izvade:

 Shubham Jadon 

4. piemērs

 public class SystemNanoTimeExample4 { public static void main(String[] args) { System.out.println('Current time in nanoseconds = '+System.nanoTime()); } } 

Izvade:

 Current time in nanoseconds = 1316893720017448 

5. piemērs

 public class SystemIdentityHashCodeExample5{ public static void main(String[] args) { String a=new String (); a.equals('Shubham'); System.out.println('identity hash code of object a = '+System.identityHashCode(a)); String b=new String (); b.equals('Jadon'); System.out.println('identity hash code of object b = '+System.identityHashCode(b)); } } 

Izvade:

 identity hash code of object a = 843730481 identity hash code of object b = 743673026 

6. piemērs

 import java.util.Properties; public class SystemGetPropertiesExample6 { public static void main(String[] args) { System.out.println('Your System property for user'); Properties p = System.getProperties(); System.out.println(p.getProperty('user.name')); //property to get User's account name System.out.println(p.getProperty('user.home')); //property to get User's home directory System.out.println(p.getProperty('user.dir')); //property to get User's current working directory } } 

Izvade:

 Your System property for user shubham C:UsersShubham Jadon C:UsersShubham Jadoneclipse-workspace	point 

7. piemērs

 import java.util.Properties; public class SystemGetPropertyExample7{ public static void main(String[] args) { //here we created property with my name and assigned its default value ShubhamJadon System.out.println('my name : '+System.getProperty('myname', 'Shubham Jadon')); } } 

Izvade:

 my name : Shubham Jadon 

8. piemērs

 public class SystemMpaLibraryNameExample8 { public static void main(String[] args) { System.out.println('map library for OS's name = '+System.mapLibraryName('os.name')); System.out.println('map library for OS's architecture = '+System.mapLibraryName('os.arch')); System.out.println('map library for OS's version = '+System.mapLibraryName('os.version')); } } 

Izvade:

 map library for OS's name = os.name.dll map library for OS's architecture = os.arch.dll map library for OS's version = os.version.dll