The script extracts the condition expressions from the Java code

if.awk

#!/use/bin/env gawk --exec
#
# Copyright (c) 2023 Jegors Čemisovs
# License: Apache-2.0 license
# 
# The script extracts if statements from Java code.
#
BEGIN {
    RS = "[[:space:]]*[;{][[:space:]]*"
}
/^if[[:space:]]*\(/ {
    print if_condition()
}

function if_condition(   parenthesis,start,i,symbol,expresson) {
    for (start = i = index($0, "("); i <= length($0) ; ++i){
        symbol = substr($0, i, 1)
        if (symbol == "(") ++parenthesis
        else if (symbol == ")") --parenthesis
        if (!parenthesis) break
    }
    expresson = substr($0, start, 1 + i - start)
    gsub(/[[:space:]]+/, " ", expresson)
    return expresson
}