JSP 2.0 Expression Language - Composite Expressions

This example illustrates EL composite expressions. Composite expressions are formed by grouping together multiple EL expressions. Each of them is evaluated from left to right, coerced to String, all those strings are concatenated, and the result is coerced to the expected type.

EL Expression Type Result ${'hello'} wo${'rld'} String hello world ${'hello'} wo${'rld'} String hello world ${1+2}.${220} Double 3.22 ${1+2}.${220} Double 3.22 000${1}${7} Long 17 000${1}${7} Long 17 ${undefinedFoo}hello world${undefinedBar} String hello world ${undefinedFoo}hello world${undefinedBar} String hello world ${undefinedFoo}${undefinedBar} Double 0.0 ${undefinedFoo}${undefinedBar} Double 0.0 ${undefinedFoo}${undefinedBar} Long 0 ${undefinedFoo}${undefinedBar} Long 0

EL Expression	Type	Result
${'hello'} wo${'rld'}	String	hello world
${'hello'} wo${'rld'}	String	hello world
${1+2}.${220}	Double	3.22
${1+2}.${220}	Double	3.22
000${1}${7}	Long	17
000${1}${7}	Long	17
${undefinedFoo}hello world${undefinedBar}	String	hello world
${undefinedFoo}hello world${undefinedBar}	String	hello world
${undefinedFoo}${undefinedBar}	Double	0.0
${undefinedFoo}${undefinedBar}	Double	0.0
${undefinedFoo}${undefinedBar}	Long	0
${undefinedFoo}${undefinedBar}	Long	0