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    <p>1) don't pass the temp inside methods, because you already have this value in member variable.</p> <p>2) you can change if (condition) then true else false into return (condition) and it will be the same result, just for readability .</p> <p>3) you should return boolean not Boolean wrapper until you need the wrapper.</p> <pre><code>public final class FreezingBoilingPoints { private int temperature; public FreezingBoilingPoints(int temp) { temperature = temp; } public void setTemperature(int temp) { temperature = temp; } public int getTemperature() { return temperature; } private boolean isEthylFreezing() { return (temperature &lt;= -173); } private boolean isEthylBoiling() { return (temperature &gt;= 172); } private boolean isOxygenFreezing() { return (temperature &lt;= -362); } private boolean isOxygenBoiling() { return (temperature &gt;= -306); } private boolean isWaterFreezing() { return (temperature &lt;= 32) ; } private boolean isWaterBoiling() { return (temperature &gt;= 212); } public String showTempinfo() { StringBuilder result = new StringBuilder(); if (isEthylFreezing()) { result.append("Ethyl will freeze"); result.append("\n"); } if (isEthylBoiling()) { result.append("Etheyl will boil"); result.append("\n"); } if (isOxygenFreezing()) { result.append("Oxygen will freeze"); result.append("\n"); } if (isOxygenBoiling()) { result.append("Oxygen will Boil"); result.append("\n"); } if (isWaterFreezing()) { result.append("Water will freeze"); result.append("\n"); } if (isWaterBoiling()) { result.append("Water will boil"); result.append("\n"); } return result.toString(); } } </code></pre> <p>Main:</p> <pre><code>import java.util.Scanner; public class FreezingBoilingTester { public static void main(String[] args) { Scanner scan = new Scanner(System.in); System.out.println("Please enter a temperature: "); int temperature = scan.nextInt(); FreezingBoilingPoints temp1 = new FreezingBoilingPoints(temperature ); System.out.println(temp1.showTempinfo()); } } </code></pre> <p><strong>updated</strong>: you can use String concatenation:</p> <pre><code>String result = ""; if ( condition ) { result += "new result"; result += "\n"; } </code></pre> <p>but this is not recommended in term of performance, because each += operation will create another String object in memory holding the new result.</p>
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    1. COok yours actually helped me the most but I can't use the StringBuilder method in my program because we haven't learned it yet. How do I get it to return it without using the string builder?
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    2. COcheck updated answer, anyway don't do this in real world :)
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