1. 把Strings转换成int和把int转换成String
String a = String.valueOf(2);
//integer to numeric string int i = Integer.parseInt(a); //numeric
string to an int String a = String.valueOf(2);
//integer to numeric
stringint i = Integer.parseInt(a);
//numeric string to an int
2. 向Java文件中添加文本
Updated: Thanks Simone for pointing to exception. I have
changed the code. BufferedWriter ut = null; try
{ out = new BufferedWriter(new FileWriter(”
filename”, true)); out.write(”
aString”); } catch (IOException e) { // error processing code } finally
{ if (out != null) { out.close(); } } BufferedWriter ut = null;try {out = new BufferedWriter(new
FileWriter(”filename”, true));out.write(”aString”);} catch
(IOException e) {// error processing code} finally {if (out
!= null) {out.close();}}
1. 把Strings转换成int和把int转换成String
String a = String.valueOf(2); //integer to numeric string int i = Integer.parseInt(a); //numeric string to an int
String a = String.valueOf(2); //integer to numeric string int i = Integer.parseInt(a); //numeric string to an int |
2. 向Java文件中添加文本
Updated: Thanks Simone for pointing to exception. I have
changed the code.
BufferedWriter ut = null;
try
{
out = new BufferedWriter(new FileWriter(”
filename”, true));
out.write(”
aString”);
} catch (IOException e) {
// error processing code
} finally
{
if (out != null) {
out.close();
}
}
BufferedWriter ut = null; try { out = new BufferedWriter(new FileWriter(”filename”, true)); out.write(”aString”); } catch (IOException e) { // error processing code } finally { if (out != null) { out.close(); } }
3. 获取Java现在正调用的方法名
String methodName =
Thread.currentThread().getStackTrace()[1].getMethodName();
4. 在Java中将String型转换成Date型
java.util.Date =
java.text.DateFormat.getDateInstance().parse(date String); java.util.Date = java.text.DateFormat.getDateInstance().parse(date
String);or SimpleDateFormat format = new SimpleDateFormat( "dd.MM.yyyy"
); Date date = format.parse( myString ); SimpleDateFormat format = new SimpleDateFormat( "dd.MM.yyyy" );Date date
= format.parse( myString );
6.将Java中的util.Date转换成sql.Date
java.util.Date utilDate = new
java.util.Date(); java.sql.Date sqlDate = new java.sql.Date
(utilDate.getTime()); java.util.Date utilDate = new java.util.Date();java.sql.Date sqlDate =
new java.sql.Date(utilDate.getTime());
本文介绍了如何在Java中进行基本的数据类型转换,包括String与int之间的转换;演示了如何向Java文件添加文本;提供了获取当前调用方法名的方法;并详细说明了如何在Java中将String类型转换为Date类型及反之,最后还展示了如何将util.Date转换为sql.Date。
14万+

被折叠的 条评论
为什么被折叠?



