55 lines
1.6 KiB
Java
55 lines
1.6 KiB
Java
/*
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* Copyright 2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package java;
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/**
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* Performance class
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*
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* @author <a href="https://erik.thauvin.net/">Erik C. Thauvin</a>
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* @since 1.0
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*/
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public class Performance {
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public static void main(String[] as) {
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for (int i = 0; i < 10; i++) {
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Performance p = new Performance(); // Avoid this whenever you can it's really expensive
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}
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}
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private boolean checkTrimEmpty(String str) {
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for (int i = 0; i < str.length(); i++) {
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if (!Character.isWhitespace(str.charAt(i))) {
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return false;
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}
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}
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return true;
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}
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void foo() {
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StringBuffer sb = new StringBuffer();
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sb.append("a"); // avoid this
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String foo = " ";
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StringBuffer buf = new StringBuffer();
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buf.append("Hello"); // poor
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buf.append(foo);
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buf.append("World");
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buf.append("Hello").append(" ").append("World");
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StringBuffer sbuf = new StringBuffer("tmp = " + System.getProperty("java.io.tmpdir")); // poor
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}
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}
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