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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8136500
* @summary Test Integer.toString method
*/
public class ToString {
public static void main(String[] args) throws Exception {
test("-2147483648", Integer.MIN_VALUE);
test("2147483647", Integer.MAX_VALUE);
test("0", 0);
// Wiggle around the exponentially increasing base.
final int LIMIT = (1 << 15);
int base = 10000;
while (base < Integer.MAX_VALUE / 10) {
for (int d = -LIMIT; d < LIMIT; d++) {
int c = base + d;
if (c > 0) {
buildAndTest(c);
}
}
base *= 10;
}
for (int c = 1; c < LIMIT; c++) {
buildAndTest(Integer.MAX_VALUE - LIMIT + c);
}
}
private static void buildAndTest(int c) {
if (c <= 0) {
throw new IllegalArgumentException("Test bug: can only handle positives, " + c);
}
StringBuilder sbN = new StringBuilder();
StringBuilder sbP = new StringBuilder();
int t = c;
while (t > 0) {
char digit = (char) ('0' + (t % 10));
sbN.append(digit);
sbP.append(digit);
t = t / 10;
}
sbN.append("-");
sbN.reverse();
sbP.reverse();
test(sbN.toString(), -c);
test(sbP.toString(), c);
}
private static void test(String expected, int value) {
String actual = Integer.toString(value);
if (!expected.equals(actual)) {
throw new RuntimeException("Expected " + expected + ", but got " + actual);
}
}
}
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