useful_code_snippets

Code

// Converting int to String and Strings to int

// Integer to numeric string
String numericString = String.valueOf(2);

// Numeric string to an int
int integer = Integer.parseInt(numericString); 

Dump(numericString, "Numeric String");
Dump(integer, "Int");

// Converting String to date in Java
String myStringDate = "21.09.2018";

SimpleDateFormat format = new SimpleDateFormat( "dd.MM.yyyy" );
Date date = format.parse( myStringDate );

Dump(date, "Date");

// Converting Java util.Date to sql.Date
SimpleDateFormat simpleDateFormat = new SimpleDateFormat( "dd/MM/yyyy" );
Date utilDate = simpleDateFormat.parse("21/09/2018");

java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());

Dump(utilDate, "Util Date");
Dump(sqlDate, "SQL Date");


// Get name of current method
String methodName = Thread.currentThread().getStackTrace()[1].getMethodName(); 
Dump(methodName, "Current Method Name");

Result

Console

Numeric String => 2
Int => 2
Date => 2018-09-21T00:00:00.000
Util Date => 2018-09-21T00:00:00.000
SQL Date => 2018-09-21
Current Method Name => main

Bytecode

Compiled from "RunnContainer.java"
public class io.jpad.scratch.RunnContainer {
  public io.jpad.scratch.RunnContainer();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  public static void main(java.lang.String...) throws java.lang.Exception;
    Code:
       0: iconst_2
       1: invokestatic  #2                  // Method java/lang/String.valueOf:(I)Ljava/lang/String;
       4: astore_1
       5: aload_1
       6: invokestatic  #3                  // Method java/lang/Integer.parseInt:(Ljava/lang/String;)I
       9: istore_2
      10: aload_1
      11: ldc           #4                  // String Numeric String
      13: invokestatic  #5                  // Method io/jpad/scratch/Dumper.Dump:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
      16: pop
      17: iload_2
      18: invokestatic  #6                  // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
      21: ldc           #7                  // String Int
      23: invokestatic  #5                  // Method io/jpad/scratch/Dumper.Dump:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
      26: pop
      27: ldc           #8                  // String 21.09.2018
      29: astore_3
      30: new           #9                  // class java/text/SimpleDateFormat
      33: dup
      34: ldc           #10                 // String dd.MM.yyyy
      36: invokespecial #11                 // Method java/text/SimpleDateFormat."<init>":(Ljava/lang/String;)V
      39: astore        4
      41: aload         4
      43: aload_3
      44: invokevirtual #12                 // Method java/text/SimpleDateFormat.parse:(Ljava/lang/String;)Ljava/util/Date;
      47: astore        5
      49: aload         5
      51: ldc           #13                 // String Date
      53: invokestatic  #5                  // Method io/jpad/scratch/Dumper.Dump:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
      56: pop
      57: new           #9                  // class java/text/SimpleDateFormat
      60: dup
      61: ldc           #14                 // String dd/MM/yyyy
      63: invokespecial #11                 // Method java/text/SimpleDateFormat."<init>":(Ljava/lang/String;)V
      66: astore        6
      68: aload         6
      70: ldc           #15                 // String 21/09/2018
      72: invokevirtual #12                 // Method java/text/SimpleDateFormat.parse:(Ljava/lang/String;)Ljava/util/Date;
      75: astore        7
      77: new           #16                 // class java/sql/Date
      80: dup
      81: aload         7
      83: invokevirtual #17                 // Method java/util/Date.getTime:()J
      86: invokespecial #18                 // Method java/sql/Date."<init>":(J)V
      89: astore        8
      91: aload         7
      93: ldc           #19                 // String Util Date
      95: invokestatic  #5                  // Method io/jpad/scratch/Dumper.Dump:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
      98: pop
      99: aload         8
     101: ldc           #20                 // String SQL Date
     103: invokestatic  #5                  // Method io/jpad/scratch/Dumper.Dump:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
     106: pop
     107: invokestatic  #21                 // Method java/lang/Thread.currentThread:()Ljava/lang/Thread;
     110: invokevirtual #22                 // Method java/lang/Thread.getStackTrace:()[Ljava/lang/StackTraceElement;
     113: iconst_1
     114: aaload
     115: invokevirtual #23                 // Method java/lang/StackTraceElement.getMethodName:()Ljava/lang/String;
     118: astore        9
     120: aload         9
     122: ldc           #24                 // String Current Method Name
     124: invokestatic  #5                  // Method io/jpad/scratch/Dumper.Dump:(Ljava/lang/Object;Ljava/lang/String;)Ljava/lang/Object;
     127: pop
     128: return
}

Jpad Version:1.07

viewCount:2073

Creator: marcelocomp

Latest Editor: marcelocomp

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**code [useful_code_snippets.java](/example/1K/useful-code-snippets)**

// Converting int to String and Strings to int
    
    // Integer to numeric string
    String numericString = String.valueOf(2);
    
    // Numeric string to an int
    int integer = Integer.parseInt(numericString); 
    
    Dump(numericString, "Numeric String");
    Dump(integer, "Int");
    
    // Converting String to date in Java
    String myStringDate = "21.09.2018";
    
    SimpleDateFormat format = new SimpleDateFormat( "dd.MM.yyyy" );
    Date date = format.parse( myStringDate );
    
    Dump(date, "Date");
    
    // Converting Java util.Date to sql.Date
    SimpleDateFormat simpleDateFormat = new SimpleDateFormat( "dd/MM/yyyy" );
    Date utilDate = simpleDateFormat.parse("21/09/2018");
    
    java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());
    
    Dump(utilDate, "Util Date");
    Dump(sqlDate, "SQL Date");
    
    
    // Get name of current method
    String methodName = Thread.currentThread().getStackTrace()[1].getMethodName(); 
    Dump(methodName, "Current Method Name");
**Result:**

Numeric String => 2
    Int => 2
    Date => 2018-09-21T00:00:00.000
    Util Date => 2018-09-21T00:00:00.000
    SQL Date => 2018-09-21
    Current Method Name => main