Difference between revisions of "Concatenating arrays"
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{{1010PrAD|ProblemName=Create a Grocery List | {{1010PrAD|ProblemName=Create a Grocery List | ||
− | |Problem= | + | |Problem=Join an array of strings together to create a single string. |
− | Example | + | Example:<br> |
− | + | {{CodeBlock | |
− | + | |Code= | |
+ | String[] strings = { "First ", | ||
+ | "Second ", | ||
+ | "Third" }; | ||
+ | }} | ||
+ | Would have output: | ||
+ | {{OutputBlock | ||
+ | |Code= | ||
+ | "First Second Third" | ||
+ | }} | ||
|SideSectionTitle=More with Arrays | |SideSectionTitle=More with Arrays | ||
|SideSection= | |SideSection= | ||
− | [[Image:Wiki_method01.jpg| | + | [[Image:Wiki_method01.jpg|center]]<BR> |
− | + | ||
|Solution= | |Solution= | ||
− | + | There are multiple ways of joining strings together. The simplest way is to use the plus symbol, which you are probably familiar with. | |
+ | {{CodeBlock | ||
+ | |Code= | ||
+ | for( int i = 0; i < strings.length; i++ ) | ||
+ | { | ||
+ | tempString1 = tempString1 + strings[i]; | ||
+ | } | ||
+ | System.out.println( "1. " + tempString1 ); | ||
+ | }} | ||
− | | | + | The String class also offers the method concat() to concatenate strings. |
− | + | {{CodeBlock | |
+ | |Code= | ||
+ | for( int i = 0; i < strings.length; i++ ) | ||
{ | { | ||
+ | tempString2 = tempString2.concat( strings[i] ); | ||
+ | } | ||
+ | System.out.println( "2. " + tempString2 ); | ||
+ | }} | ||
+ | |||
+ | |||
+ | Java also offers the StringBuilder class which is best used when building up larger strings. | ||
+ | {{CodeBlock | ||
+ | |Code= | ||
+ | for( int i = 0; i < strings.length; i++ ) | ||
+ | { | ||
+ | sb.append( strings[i] ); | ||
+ | } | ||
+ | tempString3 = sb.toString(); | ||
+ | System.out.println( "3. " + tempString3 ); | ||
+ | |||
+ | }} | ||
+ | |||
+ | |||
+ | |||
+ | |SolutionCode= | ||
+ | |||
+ | public class stringTests | ||
+ | { | ||
+ | public static void main(String[] args) | ||
+ | { | ||
+ | String tempString1 = new String(); | ||
+ | String tempString2 = new String(); | ||
+ | String tempString3 = new String(); | ||
+ | |||
+ | String[] strings = { "First ", | ||
+ | "Second ", | ||
+ | "Third" }; | ||
+ | |||
+ | for( int i = 0; i < strings.length; i++ ) | ||
+ | { | ||
+ | tempString1 = tempString1 + strings[i]; | ||
+ | } | ||
+ | System.out.println( "1. " + tempString1 ); | ||
+ | |||
+ | for( int i = 0; i < strings.length; i++ ) | ||
+ | { | ||
+ | tempString2 = tempString2.concat( strings[i] ); | ||
+ | } | ||
+ | System.out.println( "2. " + tempString2 ); | ||
+ | |||
+ | StringBuilder sb = new StringBuilder(); | ||
+ | |||
+ | for( int i = 0; i < strings.length; i++ ) | ||
+ | { | ||
+ | sb.append( strings[i] ); | ||
+ | } | ||
+ | tempString3 = sb.toString(); | ||
+ | System.out.println( "3. " + tempString3 ); | ||
+ | |||
+ | } | ||
+ | |||
} | } | ||
− | |||
}} | }} |
Latest revision as of 16:31, 4 December 2011
Back to the Program-A-Day homepage
ProblemJoin an array of strings together to create a single string. Example: String[] strings = { "First ", "Second ", "Third" }; Would have output: "First Second Third" |
More with Arrays | |
---|---|---|
SolutionThere are multiple ways of joining strings together. The simplest way is to use the plus symbol, which you are probably familiar with. for( int i = 0; i < strings.length; i++ ) { tempString1 = tempString1 + strings[i]; } System.out.println( "1. " + tempString1 );
for( int i = 0; i < strings.length; i++ ) { tempString2 = tempString2.concat( strings[i] ); } System.out.println( "2. " + tempString2 );
for( int i = 0; i < strings.length; i++ ) { sb.append( strings[i] ); } tempString3 = sb.toString(); System.out.println( "3. " + tempString3 ); | ||
Code |