Java tutorial
//package com.java2s; /* * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.text.TextUtils; import java.util.Arrays; import java.util.Collection; public class Main { public static boolean containsOnlyWhiteSpaces(final String... values) { if (values == null) { return true; } return containsOnlyWhiteSpaces(Arrays.asList(values)); } public static boolean containsOnlyWhiteSpaces(final Collection<String> values) { if (values == null) { return true; } for (final String str : values) { if (TextUtils.isEmpty(str)) { continue; } final int length = str.length(); for (int i = 0; i < length; i = str.offsetByCodePoints(i, 1)) { if (!Character.isWhitespace(str.codePointAt(i))) { return false; } } } return true; } }