1.5, Java - rextester

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static String replace(String t, String[] a, String[] b){
        StringBuilder result = new StringBuilder();
        StringBuilder word = new StringBuilder();
        char c;
        for(int i=0; i<t.length(); i++){
            c = t.charAt(i);
            if(c == ' ' || c == '.' || i == t.length()-1){
               result.append(getReplace(word.toString(), a, b));
               result.append(c);
               word = new StringBuilder();
            }else{
                word.append(c);
            }
        }
        return result.toString();
    }
    
    public static String getReplace(String t, String[] a, String[] b){
        String result = null, ai;
        for(int i=0; i<a.length; i++){
            ai = a[i];
            if(ai.compareToIgnoreCase(t) == 0){
                result = b[i];
                break;
            }
        }
        if(result == null){
            result = t;
        }
        return result;
    }
    
    public static void main(String[] args)
    {
        String s, t;
        t = "The Array class provides static methods to dynamically create and access Java arrays. Array permits widening conversions to occur during a get or set operation.";
        int maxN = 8;
        String[] a = {"Array", "to", "static", "and", "arrays", "get", "or", "set"};
        String[] b = {"a", "b", "c", "d", "e", "f", "g", "e"};
        
        println(t);
        println(a, "a");
        println(b, "b");
        s = replace(t, a, b);
        println(s);
    }
    
    public static void println(String[] t, String name){
        System.out.println(name + ":");
        for(String s : t){
            System.out.println("   " + s);
        }
    }
    
    public static void println(String t){
        System.out.println(t);
    }
}

[ + ] Show input
Compilation time: 0.84 sec, absolute running time: 0.14 sec, cpu time: 0.11 sec, memory peak: 18 Mb, absolute service time: 1 sec