49 lines
1.2 KiB
Java
49 lines
1.2 KiB
Java
// validating/GuavaAssertions.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Assertions that are always enabled.
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import com.google.common.base.*;
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import static com.google.common.base.Verify.*;
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public class GuavaAssertions {
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public static void main(String[] args) {
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verify(2 + 2 == 4);
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try {
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verify(1 + 2 == 4);
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} catch(VerifyException e) {
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System.out.println(e);
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}
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try {
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verify(1 + 2 == 4, "Bad math");
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} catch(VerifyException e) {
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System.out.println(e.getMessage());
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}
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try {
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verify(1 + 2 == 4, "Bad math: %s", "not 4");
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} catch(VerifyException e) {
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System.out.println(e.getMessage());
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}
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String s = "";
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s = verifyNotNull(s);
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s = null;
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try {
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verifyNotNull(s);
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} catch(VerifyException e) {
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System.out.println(e.getMessage());
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}
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try {
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verifyNotNull(s, "Shouldn't be null: %s", "arg s");
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} catch(VerifyException e) {
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System.out.println(e.getMessage());
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}
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}
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}
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/* Output:
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com.google.common.base.VerifyException
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Bad math
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Bad math: not 4
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expected a non-null reference
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Shouldn't be null: arg s
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*/
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